Answer first
The fake Type XXI 3817 v1 is the earliest widely sold replica of the Breguet Type XXI Transatlantique chronograph, reference 3817. It is the build that appeared before later revisions corrected the dial furniture and the chronograph module. What it does well is proportion. The steel case lands near the original 42mm, the tri-compax layout reads correctly from across a table, and the domed sapphire front gives the right distortion at the edges. What it does badly is the movement side. Many v1 examples run a stock Asian chronograph with a decorative rotor and no true flyback, and the pushers feel spongy rather than crisp. Buy a v1 only when the seller photographs the exact watch, shows the movement, and prices it clearly under whatever the current v2 or v3 commands. If the listing hides the caseback or uses the same stock photos as every other seller, walk away.
Understanding Fake Type XXI 3817 V10
What to look for
Case and crystal
Ask for caliper photos taken across the bezel at 3 and 9 o'clock, not a spec sheet. Check that the lugs are drilled or undrilled to match the reference you are copying, and that the crown sits flush inside the crown guards rather than standing proud. The crystal should be domed sapphire with anti-reflective coating on at least the inside surface. Flat mineral glass is a downgrade that shows up instantly under indoor lighting.
Dial and hands
Look at the subdial spacing. On the v1, the three registers often sit slightly wider apart than the original because the movement spacer forces the layout. Check the date window position and the font inside it, the applied numerals or printed markers, and the finish of the hour and minute hands. The 24-hour subdial hand should be distinct in shape from the chronograph hands. Blurry printing on the outer track is a common v1 flaw.
Movement and chronograph
Start the chronograph, let it run two minutes, then reset it. A healthy movement snaps back to zero in one motion. If the seconds hand drifts or stops short, the reset hammer is poorly set. Ask whether the 24-hour indicator tracks the hour hand or runs independently. Independent operation is rarer and worth paying for.
Caseback, strap, and hardware
Engraving depth and font matter more than the wording. Shallow laser etching on a v1 caseback is a giveaway. Check the strap stitching, the buckle tang thickness, and whether spring bars are drilled or friction fit.
Parameter bands to verify yourself
- Case diameter: 41.5mm to 42.5mm measured across the bezel at 3 to 9 o'clock.
- Lug to lug: measure it. Replica lugs often run 1mm to 2mm longer than the original, which changes how the watch sits on a 6.5 inch to 7 inch wrist.
- Thickness: many v1 builds run 0.5mm to 1.5mm thicker than the reference because of the rotor and spacer stack.
- Weight: within roughly 15 to 20 grams of a genuine example when a steel bracelet is fitted.
- Water resistance: treat any claim past 50 meters as marketing unless the seller pressure tested the watch.
- Power reserve: expect 38 to 48 hours. Anything stated above 60 hours on a v1 deserves proof.
Pitfalls
- Version confusion. Sellers label old stock as v1 when it is a rejected sample run. Ask for the purchase date and photos of the exact unit.
- Claimed flyback. A standard chronograph module cannot flyback. Test it.
- Factory-direct language. Phrases like 1:1 or Swiss made on a v1 listing usually describe nothing measurable.
- Closed caseback listings. If the movement is never shown, assume the worst and price accordingly.
- Untested water resistance. Never swim with a replica that has not been pressure tested after arrival.
- Resale expectations. v1 watches hold value poorly once a corrected version ships.
FAQ
Is v1 worse than v2 or v3
Usually yes on dial furniture and movement finishing, and usually no on case proportions. If the v1 case measures correctly and the price gap is wide, it can still be the better value.
Does the v1 chronograph have a real flyback
Most do not. Test by running the chronograph, then pressing reset without stopping it. A true flyback restarts from zero without a pause.
Can the 24-hour subdial be set on its own
On most v1 builds it follows the hour hand through the crown. Independent setting is a feature of better movements and later revisions.
Should I buy a v1 or wait
Buy a v1 when the seller documents the exact watch, the case measures correctly, and the price reflects the older movement. Wait when the listing relies on stock photos or refuses a movement shot.
Bottom line
The fake Type XXI 3817 v1 is a proportion-led replica with a weaker drivetrain. Judge it on measured dimensions, dial accuracy, and chronograph behavior, not on version labels or seller adjectives. A documented v1 at the right price beats an undocumented watch sold as something newer.