watch authentication

Watch NFC & Blockchain Passports: What a Japanese Listing Shows (2026)

Breitling, Hublot and Vacheron Constantin now issue blockchain or NFC watch passports. What each proves, what it does not, and what to ask a seller in Japan.

2026.10.06

Buying from Japan

Chronoswiss Reference Numbers: Verify a Japanese Listing (2026)

How to read a Chronoswiss reference number (CH-xxxx-xx): the collection, case material, and dial-color code, so you can check a Japanese listing before you buy.

2026.10.04

Reference Guides

H. Moser & Cie Reference Numbers: Verify a Japanese Listing (2026)

H. Moser reference numbers run XXXX-YYYY, and the first digit is the collection. Decode an H. Moser serial number question and verify a Japanese listing remotely.

2026.10.01

Buying Guide

Blancpain Reference Numbers: Verify a Japanese Listing (2026)

A Blancpain reference number decodes into model, case material, and strap. Learn to read all three blocks and verify a Japanese listing against official specs.

2026.10.01

Buying from Japan

Girard-Perregaux Reference Numbers: Verify a Japanese Listing (2026)

A Girard-Perregaux reference number encodes the model, case material and dial. How to read the caseback and verify a Girard-Perregaux from a Japanese listing, 2026.

2026.09.29

Buying Guide

Audemars Piguet Reference Numbers: Verify a Japanese Listing (2026)

Read an Audemars Piguet reference number segment by segment, decode the case-material letters, and check a Royal Oak against a Japanese listing before you buy.

2026.09.28

Buying from Japan

Franck Muller Reference Numbers: Verify a Japanese Listing (2026)

A Franck Muller reference number is a case-size code plus feature letters (SC, DT, CC), not a model year. Here is how to decode one and verify a Japanese listing.

2026.09.25

Buying Guide