FACTORY AUTHENTICATION GUIDE
VSF Factory Guide
Serial numbers tell only part of the story. Here is how VSF Factory's batch codes work, how to check them against your watch, and what else separates a true top-tier build from a copy of a copy.
Serial numbers are not fixed.
Top factories like VSF rotate their serial number combinations by production batch and publish updated lists through their own channels. Compare a watch against an outdated list and you can easily mistake a genuine build for a fake, or the reverse.
If the codes never changed, anyone could copy a single known string and ride the reputation of a good batch. Updates also do not land for every series at once — a Datejust refresh and a Submariner refresh can be months apart.
Serial Code Chart by Series
Compare directly, but remember that model and bracelet type must match exactly — the same code can legitimately appear on more than one reference.
Datejust Series
- 41mm Jubilee bracelet
- ORVK6GP6EB1R
- 41mm Oyster bracelet
- K6G7UL
- 36mm Jubilee bracelet
- F6UP2KB5R
- 36mm Oyster bracelet
- F6U
Day-Date
- All current references
- V8M3CRK3L4WR
Oyster Perpetual Series
- 36mm
- U7T
- 41mm
- 989
Explorer Series
- 39mm
- U7T
- 36mm
- TL11
Air-King & Sea-Dweller
- Air-King 40mm
- UZ2
- Sea-Dweller 43mm
- 7QE
GMT Series
- Jubilee bracelet
- A9A8CEB3GF6U
- Oyster bracelet
- 1NQC7S6MW
Yacht-Master Series
- White gold, rubber strap
- W5T
- 40mm, rubber strap
- 2WP
- 40mm, Oyster bracelet
- E4F2WPNOR
Submariner Series
- 41mm
- SR8ST9E7YF80099
Milgauss Series
- 40mm
- 1JR
Daytona
- 4130 movement, steel bracelet
- 7CDV8SB0D2HDBJ2
- 4131 movement, steel bracelet
- B1TRP9B3CQ8V5NXJ7NM5X
- 4130 movement, rubber strap
- 6LV
- 4131 movement, rubber strap
- 7CD
Note: codes can repeat across different references — F6U, for example, appears on the Datejust 36mm (Jubilee and Oyster) and on the GMT Jubilee. That overlap is normal in a factory's serial system, as long as the model and bracelet line up with the code.
How to Verify a Serial Number
- 01
Confirm where the serial number is engraved
Engraving locations vary by series: the inner side of the clasp, the case flank between the lugs, or the rehaut. Use a macro lens or a high-magnification loupe rather than the naked eye — shallow engraving makes 8/B and 0/O easy to confuse.
- 02
Match the watch model and bracelet type
Confirm the series, case size, and bracelet (Jubilee, Oyster, or rubber) before comparing the code. All three must line up with the reference list exactly — a Datejust 41mm Jubilee code on a Submariner case is an immediate red flag.
- 03
Check the serial number against the latest batch list
Serial lists are refreshed per production run, and not every series updates on the same schedule. A code that is missing from the newest list is not automatically fake, but it warrants more evidence from the seller.
- 04
Rule out franken or swapped-case builds
A correct serial number only confirms the case and bracelet. Buyers comfortable opening a case back can check whether the movement finishing matches the stated factory and batch — serious channels support this inspection on request.
Beyond the Serial Number
A matching serial number is a quick filter, not a finish line — codes can be printed and engravings can be copied. Real authentication cross-checks several details at once.
Surface Details
Dial font thickness, the color and curvature of the cyclops AR coating, and whether ceramic bezel markings are filled evenly and cleanly.
Calibre Finishing
On a 4130 or 4131-based Daytona build, shock absorber shape, finishing patterns, and engraving style are the hardest details for a lesser factory to replicate in one pass.
Clasp Craftsmanship
Beyond the engraving itself, check the brushing and polishing transitions on the clasp and the damping feel of the folding action.
Five Checks That Avoid Scams
- 01
Ask for the current serial batch before buying — not a list from six months ago.
- 02
Request a close-up photo of the actual engraving on the exact watch you are purchasing.
- 03
For high-value pieces, negotiate a case-back opening to verify the movement directly.
- 04
Treat a correct serial number as a baseline, not a justification for inflated pricing.
- 05
Keep your own log of batch updates so outdated codes stop catching you out.
Send Us the Engraving. We'll Check It.
Share the reference, bracelet type, and a close-up photo of the serial number. Our team will confirm it against the current VSF batch list.
