Short answer
Calibre 333116 does not appear in the public movement catalogs of Rolex, Cartier, Omega, Breitling, ETA, or Sellita. Watch movement indexes carry no Swiss caliber under that number. The string 333116 shows up in replica product listings. Treat it as a seller code for a generic movement, not as a factory caliber name.
Where the number comes from
Replica sellers reuse internal numbers. Some numbers copy real references. Some are invented. A listing that reads calibre 333116 tells you the seller wants a technical label on the page. It does not tell you which factory built the movement or which base caliber sits inside the case.
Movements often sold under this label
Most listings that carry a 333116 tag are chronographs. Three movement families cover the bulk of that market.
- Seagull ST19. Manual wind, column wheel, 21,600 vibrations per hour, about 40 hours of power reserve. Common in vintage style chronograph replicas.
- 7750 pattern clones. Automatic, 28,800 vph, about 44 hours of reserve, three register dial layout. Built by several Chinese factories.
- Quartz chronographs. Battery powered, no balance wheel, no service interval. These sell under $150 in most cases.
Movements get swapped between production batches. The same listing can ship with different internals six months apart.
Dimensions to check
A 7750 pattern movement is 30 mm across and 7.9 mm thick. Cases built around it run 14 mm to 16 mm thick. A listing that claims 11 mm thickness with a three register chronograph face is not using that movement. Ask for a caliper photo of the caseback side.
The Seagull ST19 is about 27.4 mm across and 5.5 mm thick. Watches built on it sit near 12 mm to 13 mm. A slim case points to a module or a quartz build.
Questions for the seller
- Movement photo with the caseback removed.
- Case diameter, thickness, and lug width in millimeters.
- Power reserve in hours, measured on the seller's bench.
- Date quickset position and crown positions.
- Pusher action. Start, stop, reset. Note if the reset hand snaps back or drags.
- Return window and who pays return shipping.
Limits
No factory service center will touch these movements. A local watchmaker in the US can clean and oil a 7750 pattern clone for $80 to $150. Parts come from donor movements. A Seagull ST19 swap can cost less than a service.
Resale value is near zero. Treat the purchase as a disposable item.