Reference Numbers Jacob & Co. Reference Numbers: Verify a Japanese Listing (2026)
Jacob and Co publishes no reference number key. One part of the model number is decodable, and this guide shows how to verify a Japanese listing with it.
2026-10
Reference Numbers Buying from Japan Montblanc Reference Numbers: Verify a Japanese Listing (2026)
Montblanc has no public reference-number decoder. Here is what the 6-digit catalog number, the caliber code, and the serial actually prove before you buy from Japan.
Buying from Japan Yahoo Auctions Watch Scams: 4 Listing Tricks That Aren’t Fakes (2026)
Yahoo Auctions and Mercari watch scams are not always fakes. See 4 listing tricks: photo-only sales, shipping markups, and feedback farming, and how to catch each.
Buying from Japan AI Watch Authentication in 2026: What It Can and Can’t Prove
AI watch authentication in 2026: what eBay, Chrono24 and photo apps actually verify before you pay a private Japanese seller.
Reference Numbers Credor Reference Numbers: What a Japanese Listing Shows (2026)
Credor has no public reference-number key. Verify a Japanese Credor listing with Seiko model lookup, caliber dating, and collection checks.
Buying from Japan Antique Pocket Watches from Japan: Dating & Duty Rules (2026)
How to date an antique pocket watch from a Japanese listing by its movement serial, case terms like 金無垢, and the 100-year antique duty rule for the US and UK.
Buying Guides King Seiko Reference Numbers: Vintage Japanese Listing Guide (2026)
Decode vintage King Seiko reference numbers by generation (1961-1975): 44KS, 45KS, 56KS, 52KS, factory, caliber, and how to verify a Japanese listing.
Buying Guides Universal Geneve Reference Numbers: Verify a Japanese Listing (2026)
Universal Geneve has no official reference number key. This guide shows what actually dates a vintage Polerouter: serial ranges, caliber, and redial tells.
Reference Guides Oris Reference Numbers: Verify a Japanese Listing (2026)
How to decode an Oris speaking-number reference (movement, case, material codes), read the serial, and check warranty before buying from a Japanese listing.
Buying Guides Hublot Reference Numbers: Verify a Japanese Listing (2026)
Decode Hublot reference numbers block by block — model family, case material, movement — and confirm a Japanese pre-owned listing matches what it claims.