Short answer
Omega caliber 2861 is a number that shows up in replica listings, not on Omega product pages. Buyers who search this term see two things: a copy watch with "2861" etched or printed on the caseback, and a third-party movement inside the case. The number on a copy is a label. It does not prove a real Omega movement sits under the rotor.
Where the number comes from
Omega movement numbers run in families. Caliber 1861 is the hand-wound chronograph in the Speedmaster Professional. Caliber 1863 is the same movement with a sapphire display back. Numbers in the 28xx range do not appear on Omega's current model pages. Movement databases hold thin records for 2861. Some forum posts tie it to a 1990s quartz chronograph. No catalog page backs that claim.
What sits inside a 2861 copy
Copies sold under this label use one of four movements:
omega watch caliber 2861 copy watch
- Quartz chronograph, 32,768 Hz crystal, Ronda or Miyota base. Pushers click with no resistance.
- Hand-wound chronograph, 18,000 vph, Seagull ST19 base. Subdials at 3, 6 and 9.
- Automatic, 21,600 vph, 21 jewels, 40 hour power reserve.
- Automatic chronograph, 28,800 vph, 25 jewels, center seconds hand.
How to check a copy before you pay
- Ask for a photo of the movement, not the dial.
- Count subdials. Three registers point to a chronograph base. Two registers with running small seconds is a different movement.
- Watch the seconds hand. A quartz copy ticks once per second. A mechanical copy sweeps at 5 to 8 beats per second.
- Read the engraving. Laser etch on a rotor looks flat. Stamped metal has raised edges.
- Test the crown. Three positions (wind, date, time) rule out a two-hand quartz.
Price bands
Quartz copies with a 2861 label run $80 to $140. Hand-wound chronograph copies run $150 to $260. Automatic chronograph copies run $220 to $400. Price tracks the movement. It does not track the number on the back.
US import rules
US Customs and Border Protection seizes watch shipments that carry a protected trademark. Sellers who ship to US addresses carry that risk. A buyer faces no criminal charge on a personal order, but the package can be held or destroyed at the border.
What is unknown
No public Omega document confirms caliber 2861 as a production movement. If a seller cannot send a movement photo and a beat rate, the 2861 tag carries no weight. Treat the number as a marketing term, then judge the watch on the movement you can see.