Oris Reference Numbers: Verify a Japanese Listing (2026)

What an Oris reference number tells you

An Oris reference number — a string such as 01 733 7732 4135-07 8 21 05PEB — is what Oris itself calls a “speaking number”: a code built from blocks that each describe part of the watch, rather than a random stock-tracking string. Oris publishes an explanation of this system on its own customer help pages, but that page sits behind a bot-blocking check and most buyers never see it. What they do see is a long number printed on a Japanese dealer’s listing, with no breakdown of what any of it means.

This guide decodes the blocks using Oris’s own product pages — fetched directly, with the exact reference number and specification quoted for each example — plus two independent watch-identification guides for the serial number. It covers the movement code, the case and material blocks, how to read the 7-digit serial, and what changes about warranty and service once a watch leaves Japan.

How to read the number, segment by segment

A modern Oris reference has up to five parts: a fixed prefix, a movement code, a case/model-family code, a material-and-size code, and — after a dash — a strap or bracelet code. Not every listing quotes the full string past the dash, but the first four blocks are what identify the watch itself.

1. The fixed prefix (“01”)

Every modern Oris reference opens with 01. It does not vary by model — it is simply the index that marks the number as a current-generation Oris reference, as opposed to older numbering used before the modern system.

2. The movement block (three digits)

The second block names the caliber family inside the watch. Two values account for most of Oris’s current catalog:

• 733 (and the closely related 733-1) — an automatic movement built on the Sellita SW200 base, with a power reserve in the 38–41 hour range depending on the exact reference.
• 400 — Oris’s in-house Calibre 400, with a 120-hour (5-day) power reserve, higher antimagnetic resistance, and a 10-year warranty/service interval once registered (see the warranty section below).

Other three-digit codes exist for small-seconds and chronograph variants (743, 739, and others), but 733 and 400 are what you will see on the large majority of Aquis and Diver’s Sixty-Five listings.

3. The case/model-family block (four digits)

The third block identifies the case shape and model line — for example, 7730 and 7732 both appear on Aquis Date cases, while 7707 appears on Diver’s Sixty-Five Date cases, and 7763, 7769 and 7790 appear on Calibre 400 Aquis variants. Oris does not publish a master table mapping every one of these codes to a model name, so treat this block as a family identifier to cross-check against the listing’s stated model name and photos, not a stand-alone lookup.

4. The material-and-size block (four digits, before the dash)

The fourth block is the least transparent part of the code, but a pattern holds across every official Oris product page checked for this guide: the leading digit tracks the case material family, while the remaining digits track case size and dial variant within that family.

Block	Case material	Size	Model
4135	Stainless steel	39.5 mm	Aquis Date
4154	Stainless steel	43.5 mm	Aquis Date
4157	Stainless steel	43.5 mm	Aquis Date Calibre 400
4356	Bronze	40.0 mm	Diver’s Sixty-Five Date
7153	Titanium	43.5 mm	Aquis Titanium Date

Four of the five blocks above lead with “4” and cover steel and bronze cases; the titanium case leads with “7” instead. That is a pattern observed across these verified examples, not an official rule Oris has published in full — if a listing’s code does not fit the pattern, confirm the case material from photos and the caseback rather than guessing from the digits alone.

5. The strap or bracelet suffix (after the dash)

Everything after the dash — for example “-07 8 21 05PEB” — describes the strap or bracelet rather than the watch head: material, lug width, and clasp or buckle finish. Oris sells the same watch head with multiple strap options, so two listings can quote identical reference numbers up to the dash while differing entirely afterward. If a Japanese listing quotes only the pre-dash portion, ask the seller for the full code or a caseback photo before assuming which strap is included.

Worked examples from Oris’s own product pages

Each row below was read directly from the matching Oris product page, not reconstructed from a third party:

Reference	Model	Case / movement	List price (USD)
01 733 7707 4356-07 8 20 17	Diver’s Sixty-Five Date	Bronze, 40 mm, Cal. 733 (38h reserve)	$2,950
01 733 7732 4135-07 8 21 05PEB	Aquis Date	Steel, 39.5 mm, Cal. 733-1	$2,600
01 733 7789 4154-07 8 23 04PEB	Aquis Date	Steel, 43.5 mm, Cal. 733-1 (41h reserve)	$2,800
01 400 7763 4157-07 4 24 74EB	Aquis Date Calibre 400	Steel, 43.5 mm, Cal. 400 (120h reserve)	$3,700
01 733 7730 7153-07 4 24 64TEB	Aquis Titanium Date	Titanium, 43.5 mm, Cal. 733	$2,500

Two things stand out for a buyer comparing a Japanese listing against current retail: the Calibre 400 version of the same Aquis Date case carries roughly a $900–1,100 premium over the Calibre 733 version, and a titanium case can list for less than the equivalent steel model once bracelet and strap choices are factored in — titanium is lighter but not automatically more expensive at Oris’s price tier.

Calibre 733 vs. Calibre 400: why the movement code matters for price

The movement block is the single most useful part of the code for a buyer, because the difference between 733 and 400 is a real difference in what you are paying for, not a marketing label:

• Calibre 733 / 733-1 — Sellita SW200-based, 38–41 hour power reserve, Oris’s long-running workhorse movement used across most of the current Aquis and Diver’s Sixty-Five range.
• Calibre 400 — in-house movement, 120-hour (5-day) power reserve, higher resistance to magnetism, and — as Oris states on its own customer-service page — a warranty that extends to 10 years through MyOris registration, against 3 years for most other movements (see below).

A Japanese listing that only states “Aquis Date” without the movement is ambiguous on price: the Calibre 733 and Calibre 400 versions of the same case line differ by roughly a third in original retail price. Match the reference number’s movement block, or ask for a caseback and movement photo, before comparing the asking price to retail.

Serial numbers: what they can and can’t tell you

Oris serials are a separate 7-digit number, distinct from the reference. Independent watch-identification guides describe the format as a two-digit year code followed by a five-digit unique identifier — for example, a serial beginning “29” would read as 2009. One such guide publishes this range:

Serial prefix	Production year
29	2009
30	2010
31	2011
32	2012
33	2013
34	2014
35	2015

Treat this as a heuristic, not an official Oris chart. A separate independent guide that documents the same two-digit-prefix pattern explicitly calls it an “unofficial heuristic” and warns it is “not an official Oris decoder” — useful as a rough estimate, not proof of a production date. Neither guide extends the table past 2015, so for a newer watch, a serial-based date estimate is not something you can responsibly offer past that range from public sources alone. If the exact production year matters to your purchase, the reliable route is Oris’s own MyOris registration or a direct inquiry to an authorized service center.

Warranty and service: what changes once a watch leaves Japan

This matters more for Oris than for some brands, because Oris ties a meaningful part of its warranty directly to the movement code you just decoded. Per Oris’s own customer-service page:

• Standard warranty: 2 years from the purchase date, covering material and manufacturing defects.
• Extended warranty via MyOris registration: 3 years for most movements, 5 years for Calibre 100-series watches, and 10 years for Calibre 400-series watches — the same Calibre 400 identified by the “400” movement block above.
• Recommended service intervals also track the movement: in-house movements with a 5-day power reserve (Calibre 400) every 10–12 years; 10-day-reserve in-house movements every 5–7 years; “all other models” (including the 733/733-1 family) every 3–5 years.

The practical takeaway for a Japan-sourced watch: warranty coverage is tied to registration through MyOris, not automatically to the country of original sale, but the standard manufacturer warranty on an unregistered watch is international. If you plan to register for the extended term, do it promptly after the sale completes — don’t assume a dealer in Japan has already done this for you.

Why Japan is a source for Oris — and what’s different about it

Oris maintains an official boutique in Ginza, Tokyo, and has released Japan-market-exclusive pieces through it — for example, a 100-piece Aquis Date Relief limited edition that launched on November 12, 2025 at ¥495,000 (VAT included), sold only through the Ginza boutique and select Japanese retailers. That official retail presence feeds a deep pre-owned market: large Japanese dealers such as KOMEHYO carry regular pre-owned Oris stock, graded and photographed to the same detailed condition conventions used across the Japanese watch trade.

Two things to watch for specifically with Oris sourced from Japan:

• Japan-exclusive pieces carry a collector premium precisely because they were never sold outside Japan. A reference that doesn’t appear on Oris’s international product pages at all may be one of these — check the case/model-family block against a Japanese-market catalog, not the global one, before assuming it’s unlisted or unofficial.
• Condition grades are dealer conventions, not a published standard. As with any brand bought secondhand from Japan, “unused,” “mint,” and “excellent” mean different things from one shop to the next — see our guide to verifying watch service history from a Japanese listing for what to ask before trusting the label.

Verifying an Oris on a Japanese listing: 6 checks

1. Match the movement block to the stated price tier. A “733” reference priced like a Calibre 400 (or vice versa) is worth a clarifying question before you commit.
2. Match the material block to the case description and photos. A block beginning “4” should mean steel or bronze; a block beginning “7” should mean titanium. A mismatch means either a strap/case swap or a typo in the listing.
3. Ask for the full reference including the suffix after the dash. Listings that quote only the pre-dash code leave the strap or bracelet ambiguous.
4. Check engraving quality on the caseback. Genuine Oris casebacks carry clean, evenly spaced engraving for both reference and serial — shallow or irregular engraving is a red flag worth raising with the seller.
5. Don’t treat the serial prefix as a confirmed production year. Use it only as a rough cross-check against the condition described, and verify anything that matters through MyOris or an authorized service center.
6. Ask whether MyOris registration has been completed. An already-registered watch may carry extended warranty years that do not automatically transfer to a new owner — confirm this before assuming the 3/5/10-year extension applies to you.

Common mistakes and red flags

• Assuming a decoded reference proves authenticity. The material and movement pattern above is reconstructed from verified official listings, not a published master key — it is a cross-check, not a guarantee.
• Confusing Calibre 400’s 10-year warranty with an automatic benefit. The extended term requires MyOris registration; it is not automatic simply because the watch contains a Calibre 400 movement.
• Treating titanium as automatically pricier than steel. At Oris’s price tier, that is not consistent — compare the actual listed reference, not an assumption about the material.
• Using the 2009–2015 serial table to date a newer watch. Public sources don’t document the pattern past 2015; don’t extrapolate a year for a recent purchase from the prefix alone.

FAQ: Oris reference numbers

What does the “01” at the start of an Oris reference mean?

It is a fixed prefix marking the number as a current-generation Oris reference. It does not vary between models and carries no model-specific information on its own.

How do I tell a Calibre 733 from a Calibre 400 Oris from the reference number?

The second block of the reference — the three digits right after “01” — names the movement directly: 733 (or 733-1) for the Sellita-based movement, 400 for the in-house Calibre 400. This is confirmed directly on Oris’s own product pages for each reference.

Can I date an Oris watch from its serial number?

Only approximately, and only for watches made roughly 2009–2015, based on independent identification guides rather than an Oris-published chart. One of those guides explicitly calls the two-digit-prefix pattern an unofficial heuristic. For a confirmed production date, use Oris’s MyOris registration or contact an authorized service center.

Reference numbers by brand

This guide is part of a series on decoding reference and model numbers on Japanese listings. If you are comparing across brands, these companions use the same method:

• Hublot reference numbers
• Chronoswiss reference numbers
• NOMOS Glashütte reference numbers

How RYUZU WATCHES can help

If you are looking for a specific Oris reference — a Calibre 400 Aquis, a Diver’s Sixty-Five in bronze, or a Japan-exclusive piece that never shipped internationally — RYUZU WATCHES searches the Japanese market on your behalf and inspects the watch before you commit, including confirming that the reference, the case material and the photos agree. You can send a sourcing request with the reference or model you want. Our breakdown of grey-market service cost by brand is also worth reading before you buy, since after-sales terms vary by manufacturer.

Import duties and consumption tax are settled in your own country on the declared value, and are not paid on your behalf; the reference check above is about getting the watch right before any of that begins.

Summary

• An Oris reference number is a “speaking number”: prefix (01) + movement (733 or 400) + case/model family (4 digits) + material-and-size code (4 digits) + strap/bracelet suffix after a dash.
• The movement block is the most useful check for price: 733/733-1 is Oris’s Sellita-based workhorse movement; 400 is the in-house Calibre 400 with a 5-day power reserve and a 10-year warranty when registered through MyOris.
• Within the material-and-size block, a leading “4” tracked steel or bronze and a leading “7” tracked titanium across every official example checked for this guide — a pattern, not a published Oris rule.
• The 7-digit serial’s two-digit year-prefix pattern is documented only for roughly 2009–2015 by independent guides, and both describe it as an unofficial heuristic, not an Oris-published chart.
• Warranty runs 2 years standard, extendable to 3, 5 or 10 years via MyOris registration depending on the movement — confirm whether a Japan-sourced watch has already been registered before assuming the extended term applies.
• Oris has an official Ginza boutique and has sold Japan-exclusive limited editions through it, which is why a reference absent from the global catalog may still be genuine.

This article is based on Oris’s own product pages, customer-service page and independent watch-identification guides as of October 2026. Reference numbers, movement specifications and warranty terms change over time; confirm current details with Oris or an authorized dealer before buying.