An Omega Caliber 8605 replica does not contain a copy of Omega's in-house co-axial movement. It runs an Asian automatic GMT caliber, usually a 2824 or 2836 base with a 24-hour module or a purpose-built 8500-family clone, finished and rotor-engraved to look like the genuine 8605. The genuine Caliber 8605 is a 39-jewel co-axial GMT with a 60-hour power reserve, and that combination of architecture and finish is what replicas imitate, not reproduce.
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What is the genuine Omega Caliber 8605?
Caliber 8605 is Omega's automatic GMT movement from the 8500 family, fitted to the Seamaster Aqua Terra GMT. It carries the co-axial escapement, a silicon balance spring and a two-zone 24-hour hand. Omega rates the power reserve at 60 hours and lists 39 jewels.
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- Automatic winding, bi-directional rotor
- Co-Axial escapement, free-sprung balance
- GMT / dual time with independent 24-hour hand
- 60-hour power reserve, 39 jewels
- Rhodium finish with arabesque Geneva stripes
Which movement is inside a replica "8605"?
Most sellers use one of three builds, and the price tells you which one you are getting. Ask for the movement name in writing before you pay.
1. Modified 2836-2 with GMT module
This is the workhorse build. It keeps decent time, services easily and adds a jumping 24-hour hand on top of the base movement. The module makes the stack taller, so the caseback sits a fraction thicker than the genuine watch.
2. Asian 8500-family clone sold as "8605"
This is a dedicated clone with a decorated automatic bridge and a rotor cut to echo the real geometry. Visual accuracy is higher, but genuine co-axial escapement behavior is absent in nearly all versions.
3. Dressed-up 2824 with fake plates
Cheap builds bolt cosmetic plates over a basic movement. They photograph well and wear badly, because the plates trap debris and block regulation access.
How do you spot a dressed-up movement?
Look at the escapement through the caseback under a loupe, not at the rotor engraving. Real co-axial parts have a distinct three-pronged escape wheel that no typical clone reproduces at full fidelity.
- Engraving depth: laser-etched text looks flat and gray, genuine engraving is cut
- Rotor noise: a loose or gritty wobble points to a low-tier build
- GMT hand: it should jump cleanly in one-hour steps, not drift
- Balance amplitude: under 240 degrees on a timegrapher is a warning sign
What should a serious 8605 replica deliver?
A quality build keeps the wearable specs that make the Aqua Terra GMT worth owning. Expect a 41.5mm or 43mm case depending on the reference being copied, sapphire on both sides, 150m claimed water resistance and a screw-down crown.
- Power reserve of 38 to 45 hours, not the advertised 60
- Accuracy within about plus or minus 15 seconds per day out of the box
- Correctly aligned date window and 24-hour hand at the 12 position
- Bracelet end links that sit flush with no gap at the lugs
Does a replica 8605 hold value or take service?
No. Replica watches carry no factory warranty and no collector resale, and the value drops the moment you wear it. Budget for a movement service every three to five years, and confirm your local watchmaker will touch clone calibers before you buy.
FAQ
Is the 60-hour power reserve real on a replica 8605?
Almost never. Most builds deliver 38 to 45 hours, and a dressed-up 2824 drops toward 36.
Can the GMT hand be set independently?
On module-based builds, yes. On the cheapest plate-covered builds, the 24-hour hand often tracks the hour hand with no independent setting.
Is a replica 8605 the same as an Omega?
No. It is an unaffiliated copy with no connection to Omega, no tested water resistance and no service network. Buy it as a lookalike, disclose it as one, and never present it as genuine.