NW Timepieces Reference Library

NW Timepieces Reference Library

Authenticating, valuing, and buying a pre-owned luxury watch is a research project. We built this reference library out of the questions our customers ask us most often, the tools we use ourselves when evaluating watches for inventory, and the guides we wished existed when we started collecting. Everything here is free to use — no email gate, no paywall.If you have a specific question that isn't covered yet, reach out. We add new guides regularly based on what customers ask.Rolex Reference Guides:- Rolex Clasp Codes by Year (1976–2011) → /pages/rolex-clasp-codes-guide- Rolex Serial Numbers by Year → /pages/rolex-serial-numbers (coming soon)Coming Soon:- Rolex Reference Number Decoder- How to Authenticate a Pre-Owned Rolex- Watch Glossary- How to Sell Your Watch- First Luxury Watch Buyer's GuideWhy Trust NW TimepiecesWe're a family-owned Pacific Northwest watch dealer specializing in pre-owned and vintage Rolex, Patek Philippe, Audemars Piguet, Cartier, and other high-end brands. Our experience is collector-first — we got into the business because we love watches, not the other way around. Every watch in our inventory is hand-evaluated, and we're happy to help collectors authenticate watches we're not even selling.