Short Answer
A replica Omega Caliber 9800 is not an Omega movement. Omega builds Caliber 9800 in Switzerland and certifies each unit through METAS as a Master Chronometer. Replica makers take a third-party automatic movement (most often a Seagull, Hangzhou, or Miyota base) and dress it with a gold-tone rotor, engraved bridges, and a Co-Axial style balance cock so the caseback looks correct. The watch can still be a solid buy, but you are grading the clone on its own terms: beat rate, power reserve, date function, and finish. Judge those four things and you will not overpay.
What Genuine Caliber 9800 Actually Is
Caliber 9800 sits in Omega's 8900 family, the gold-rotor branch of the line. It is a self-winding Co-Axial Master Chronometer with a free-sprung silicon balance spring, a 60 hour power reserve, and a running rate of 25,200 vibrations per hour (3.5 Hz). The rotor and balance bridge are 18K gold, and the movement resists magnetic fields up to 15,000 gauss. It carries a jump hour hand for travel, plus a date at 6 o'clock on the dials it powers. A genuine example shows Geneva stripes, blackened screws, and deep laser engraving on the bridges.
What the Replica Version Usually Contains
Most sellers advertising a "9800" replica are selling one of three things: a decorated 28,800 vph Asian automatic with a printed balance cock, a clone of the 8900 architecture with a plated rotor, or a genuine Swiss ETA base that has been refinished. Only the third option comes close on reliability. The tell is the beat rate. Genuine 9800 runs at 25,200 vph. Many clones run at 28,800 vph, which is audible and measurable.
Inspection Checklist
- Ask the seller for a clear photo of the movement before you pay, not a catalog image.
- Compare the beat rate on a timegrapher reading: 25,200 vph matches the real caliber, 28,800 vph does not.
- Confirm the power reserve by winding the watch fully and checking it after 40 hours of rest.
- Test the jump hour hand by pulling the crown to the middle position and turning it.
- Check the date change at midnight for a clean snap rather than a slow creep.
- Inspect the engraving under a loupe: real laser work has depth, printing sits flat on the surface.
- Look at the rotor edge for plating wear, which appears as a copper or silver line on gold-tone finishes.
- Verify the caseback text and reference numbers match the dial configuration you ordered.
Accuracy and Power Reserve Expectations
- A good replica 9800 should hold within 10 to 15 seconds per day.
- Power reserve on a clone lands between 38 and 48 hours, not 60.
- Amplitude above 270 degrees on a full wind indicates a healthy movement.
- Anything beyond 25 seconds per day needs regulation or a return.
Care and Servicing
Keep the watch away from strong magnets even though the original is anti-magnetic. Clones use steel hairsprings in most cases, so a phone speaker or tablet cover can pull the rate off by minutes. Have the movement cleaned and oiled every three to four years, and ask the watchmaker to note the base caliber on the invoice so future parts orders are simple. Do not swim with a replica unless a pressure test confirms the gaskets, because factory seals on these cases are rated on paper only.
Bottom Line
Treat a replica Omega Caliber 9800 as a decorated Asian automatic with a convincing caseback. Pay for the case, the dial, and the bracelet finish, and accept the movement as a wear item. If the seller cannot supply a timegrapher reading or a movement photo, walk away.