Short answer
Calibre 333116 does not appear in the published movement catalogs of ETA, Sellita, Rolex, Omega, Patek Philippe, or Seiko. I could not verify any Swiss maker that uses that number. Stampings that read "Cal. 333116" show up on movements sold through replica channels and on aftermarket cases. A caliber number is a marking, not a certificate of origin.
What a caliber number means
A caliber number is a factory code for a movement design. It covers plate layout, gear train, beat rate, jewel count, and hand sizes. Makers publish those codes in service manuals and parts catalogs. Buyers use them to order parts.
Any stamp can be engraved on any bridge. A laser engraver costs less than a genuine rotor. The code on the metal and the code in the catalog must match.
Checks that separate a real caliber from a printed one
- Beat rate. Time the second hand over 60 seconds against a quartz reference. A 28,800 vph movement steps 8 times per second. A 21,600 vph movement steps 6 times. Count the steps in a slow-motion phone video.
- Jewel count. Count the ruby bearings under a loupe. 25 jewels is a common claim. A countersink with a steel pivot is not a jewel.
- Engraving quality. Factory stamps use a die or a fiber laser with fixed depth. Copies show shallow lines, a halo of burned metal, or a font that differs by one stroke.
- Rotor and bridge finish. Geneva stripes on a genuine ETA-based movement run in one direction with even spacing. Copies show chatter marks and rounded edges.
- Regulator and shock system. Note the shape of the balance cock, the regulator index, and the shock spring. Incabloc, Kif, and Etachoc parts have distinct outlines.
- Serial and reference cross-check. Send the case and movement numbers to the maker's service center. Ask for a written answer.
Numbers that get reused
Replica sellers reuse real caliber numbers, such as 2824, 3135, and 8500, on unrelated movements. They also invent numbers that no catalog lists. Public records place 333116 in the second group.
Legal status in the United States
Trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320. Penalties reach 10 years for a first offense and 20 years for repeat offenses. CBP can seize shipments. The personal-use exemption does not cover items that carry a counterfeit trademark.
What to do instead
Get a written inspection from a watchmaker with a timing machine and a case-opening bench. Ask for amplitude, beat error, and rate in three positions. Those numbers describe the movement in front of you, not the stamp on the bridge.