Short answer: buy the replica only if you want the look on your wrist and nothing past that. No replica of Omega's caliber 9800 is a 9800. The caseback may say Co-Axial Master Chronometer, but under the rotor sits a decorated third-party automatic with a standard lever escapement. If magnetic resistance, service parts, or resale matter to you, the decision makes itself.
What the real caliber 9800 is
The 9800 belongs to Omega's Co-Axial Master Chronometer family. The blueprint is consistent across that family: twin serially mounted barrels for a longer power reserve, a silicon balance spring, a free-sprung balance with no regulator index, and the Co-Axial escapement Omega has been refining since 1999. Each movement is certified by METAS, not by Omega alone. That certification runs eight tests over ten days and includes exposure to a 15,000 gauss magnetic field. It is done on the fully cased watch, which means movement and case are measured together.
replica omega caliber 9800 copy
Two numbers I check first: a beat rate of 25,200 vph and the certification card tied to the serial. Both are hard to fake in any meaningful way.
Replica Omega Caliber 9800 Comparison: What Is Really Inside
What a replica 9800 usually contains
Most replicas in this tier use a Miyota 9015 or a Chinese automatic as the base, then bolt on a decorative plate and an engraved rotor. The rotor spins, the bridges look striped, and the jewel count is printed to match the original. The escapement is a normal Swiss lever. There is no working coaxial geometry and no twin barrel, because the base movement has one mainspring.
Beat rate is the tell. The 9015 runs at 28,800 vph, so the balance oscillates faster than a real 9800 should. On a timing machine it reads as a different animal. On the wrist, almost nobody notices.
The decision checklist
1. Price against a used genuine
Add the replica price, the shipping, and the customs risk. Then price a used Omega with a real 8900 or 9800. The gap is smaller than it used to be, and the genuine watch holds value while the copy trends toward zero the moment it lands.
2. Service and parts
Many watchmakers will open a replica and hand it back. Decorative plates hide the actual movement, gaskets are generic, and a replacement rotor or crystal may not exist in two years. A genuine Omega goes to a service center or an independent with parts access.
3. Water resistance
Factory depth ratings on a replica are marketing. A 150 m rating needs a pressure test on the real case, and most replica cases are not built for it. I treat any copy as splash resistant at best, no matter what the caseback says.
4. Case and bracelet finishing
This is where the better factories have closed most of the gap. Brushed and polished transitions, end link fit, clasp action, and dial printing are often close enough for daily wear. If your goal is how it reads across a table, this is the strongest argument in favor.
5. Honesty with yourself
Nobody at dinner is checking your escapement. The question is whether you want a watch or a stand-in. Both are fine answers, but they lead to different purchases and different budgets.
Where the replica wins and where it loses
It wins on price, on visual accuracy, and on the freedom to wear it without flinching at a door frame. It loses on movement authenticity, serviceability, water resistance, and any claim of chronometer performance. There is no METAS certificate and there never will be, because that test is run on the individual watch and issued with its own number.
If you decide to go ahead
Ask which base movement is inside, not just which factory assembled it. Ask for a photo of the movement with the caseback off and for a timegrapher reading. Check the beat rate: if it reads 28,800 vph, you are looking at a Miyota or a clone of one, not a coaxial design. Budget for a strap swap and for an inspection on arrival. Then buy knowing the money is spent, not invested.