The replica Omega caliber 8605 is a 1:1 recreation of Omega's Co-Axial GMT automatic movement, the twin-barrel engine behind the Seamaster Aqua Terra GMT line. This guide covers what the replica movement actually reproduces, how it behaves in daily wear, and what to confirm before you order.
What the Replica Omega Caliber 8605 Copies
It is a self-winding Co-Axial GMT movement with an independently adjustable 24-hour hand, built around the same 39-jewel layout, twin mainspring barrels and 25,200 vph beat rate as the original. The replica keeps the practical travel features buyers look for: a jumping local-hour hand set from the crown and a power reserve of roughly 60 hours when fully wound.
Key Features
- Co-Axial style escapement with a three-level impulse pallet
- Independent GMT hand for tracking a second time zone
- Jumping hour hand for quick local-time changes without hacking the seconds
- Two series-coupled barrels delivering about 60 hours of reserve
- 39 jewels with a 25,200 vph (3.5 Hz) balance frequency
- Bidirectional automatic winding with a decorated rotor
- Silicon-style balance spring for improved anti-magnetic behaviour
- Rhodium-plated bridges with Geneva striping and engraved markings
Materials and Specifications
Bridges and plates are rhodium-finished and striped, with engraving that mirrors the factory lettering. The rotor spins on a bearing assembly tuned to stay quiet, and the case-side fitment follows the original footprint so the movement seats correctly in cases cut to the same dimensions. Balance amplitude, beat error and rate are adjusted before dispatch, and each unit is checked for smooth crown action through both the winding and GMT-setting positions.
Shipping and Returns
Orders are packed in protective foam and shipped with tracking, typically leaving the warehouse within one to three business days. If the movement arrives damaged or fails to run on arrival, contact us within the stated inspection window and we will arrange a replacement or repair.
Is the GMT hand independently adjustable?
Yes. The 24-hour hand can be set on its own, so you can read a home time zone while the main hands follow local time. The local hour jumps in one-hour steps without stopping the movement.
How accurate is the replica caliber 8605 in daily use?
A well-regulated example typically holds within a modest daily variance, comparable to a standard automatic chronometer in everyday conditions. Wearing habits, temperature and winding level all influence the final rate.
Will it fit an Aqua Terra style case?
It is dimensioned for replica cases built to the genuine movement's footprint, so it drops straight in on matching builds. Fitting it into an original factory case should be assessed by a watchmaker first.