Short answer first
On a replica Blancpain, the complete calendar with moonphase is the only complication worth your money. The module is simple, the dial reads right at arm's length, and the failure points are predictable. Perpetual calendars, minute repeaters, and carrousel tourbillons are a different story. They show up rarely in replica form, they are often visibly wrong, and when a factory does build one the price lands in used-genuine territory for other brands.
Which Blancpain complications get copied
Complete calendar moonphase
This is the volume seller, and it maps to the Villeret Quantième Complet layout: day and month windows up top, moonphase at six o'clock, and the date read by a serpentine hand on an outer track. Factories nailed it because the base is a standard three-hand automatic with a calendar plate bolted on. Nothing exotic is required.
Chronographs
The Fifty Fathoms Bathyscaphe chronograph gets cloned too, usually on a Seagull ST19 or a 7750 clone. Here is the catch: the real watch is a flyback, and the replica almost never is. If a seller claims flyback function on a sub-three-hundred-dollar chrono, they are guessing.
Tourbillons and repeaters
Chinese flying tourbillons exist and can look convincing under a loupe from the back. Minute repeaters in replica form are mostly decoration, sometimes with a hammer that moves and nothing else. Round out a Perpetual calendar and you get a dial that cannot be set correctly, which defeats the entire point of the complication.
What the movement actually is
Most moonphase replicas run a Hangzhou 6460, which is a 2824 clone with a complete calendar module stacked on top. That matters for one reason: the moon gearing uses the simple 29.5-day cycle instead of a properly computed ratio, so the disc drifts about a day every two and a half years. Genuine Blancpain gears the moonphase far more precisely. If you care about the moon showing correctly, you will be correcting it with a pusher.
What I check before buying
- Moonphase position at a known new moon. Off by more than a sliver means the disc was pressed on wrong and no corrector fixes it.
- Day and month change timing. It should flip near midnight, not at three in the morning.
- Correctors. Recessed pushers should sink and spring back. If one feels mushy, the module is cheap.
- Dial printing and applied indices. Look for uneven spacing between the day and month windows.
- Crown threads and caseback gasket. Assume zero water resistance and never swim with it.
One habit saves modules: never use the quick-set date between nine at night and three in the morning. The calendar plate is mid-jump and you will strip teeth.
Legal reality in the US
Importing counterfeit watches is illegal here. Customs can seize the parcel, and buyers have faced civil penalties. Selling one as genuine is a separate and much worse problem. Treat any purchase as a risk you accept, not a gray-area loophole.
Bottom line
If you want the look of a Blancpain complication on a budget, buy the complete calendar moonphase and skip anything with more than three complications. The extra money buys a dial that lies to you every time you look at it.