The quickest tell on a fake Blancpain is the movement, followed closely by the caseback. Blancpain builds its own calibers, finishes them properly, and engraves a case number that ties to a reference. Counterfeits usually fail at least one of those three checks. If you have two minutes and a phone, ask for photos of the caseback and, on a display-back model, the movement.

Check the movement before anything else

Blancpain does not put generic quartz movements in its watches, and it does not ship watches with blank rotors. If you can see inside, look for a caliber number stamped on the bridge, finishing that looks hand-applied rather than stamped, and the brand name in the right typeface. A rotor that wobbles, or a decorated plate screwed over what is clearly a stock movement, is a bad sign. So is a power reserve that does not match the spec. Many Blancpain calibers run for several days on a full wind, so a seller claiming a 40-hour reserve on a modern dive model is probably describing something else.

Case, bezel, and finishing

Real Blancpain cases have crisp transitions between brushed and polished surfaces. Fakes look soft there, especially around the lugs. Check these points:

• Bezel insert. Modern Fifty Fathoms models use sapphire inserts. Cheap printed inserts scratch and fade.
• Crown. It should be signed with sharp engraving, and the threads should engage without grit.
• Thickness and weight. A counterfeit often runs thicker than the reference, or feels light because the case is plated brass.
• Caseback engraving. Reference and case numbers should be cut deep, not laser-printed on the surface.

Dial printing and hands

This is where budget fakes fall apart. Look at the wordmark and the "1735" below it. The lettering should be sharp with clean serifs, and the printing should not bleed under magnification. On moonphase models, the moon face and stars should be crisp and dimensional instead of a flat printed disc. Check that the date sits centered in the window, that applied indices are level, and that the hands reach the correct track. Misaligned date wheels show up in almost every cheap copy.

Serial numbers, papers, and service history

Every Blancpain carries a case number engraved on the back. Get a clear photo of it before you talk price. Boxes, certificates, and hang tags get faked as easily as watches, so paperwork alone proves nothing. A service receipt from an authorized center is worth more. The only test that settles authenticity is an inspection by Blancpain or an authorized service center, and any honest seller will allow it.

Red flags in a listing

• Only stock photos, no caseback or movement shots.
• A price far under market for that reference.
• Reluctance to meet at a service center or ship on escrow.
• A newly created account with no selling history.
• "Swiss Made" printed badly, spaced wrong, or placed where the reference does not have it.

Counterfeit is not the same as replica

Worth keeping straight. A counterfeit is sold as the real thing at real prices with forged papers. That is fraud, and the buyer is the victim. A replica is sold as a replica at a replica price, with no claim of being genuine. If a listing says Blancpain and asks $600, it is not a replica. It is a scam aimed at someone who does not know the market.

Before you send money

Buy the seller first. Ask two questions: can I see the case number, and will you allow a service-center check. A real owner says yes to both without hesitating. If either answer gets vague, walk away. There are plenty of watches, and only one of you can afford to be wrong.