The replica Omega De Ville Trésor Co-Axial 40mm is a copy of a slim dress watch: 40mm case, about 10.5mm thick, domed dial, leather strap with a pin buckle. The genuine watch is hand wound, so the first detail to check on any copy is how it winds and what the case back shows.
What is the Omega De Ville Trésor Co-Axial 40mm?
The Trésor is Omega's thin dress line, and the 40mm Co-Axial version sits at the top of it. Steel and gold cases share the same shape: a round case, short lugs, a domed sapphire crystal, and a wide dial opening that makes the watch read larger than 40mm on the wrist.
- Case size: 40mm wide, about 10.5mm thick
- Movement: hand-wound Co-Axial Master Chronometer in the 8929 family
- Power reserve: about 72 hours
- Crystal: sapphire front and back on most steel references
- Water resistance: 30 metres, which means splashes only
- Magnetic resistance: 15,000 gauss on the genuine movement
- Strap: leather with a pin buckle, lug width near 20mm
Which specs should you compare on a first copy?
Measure the copy before you trust the listing. Case width, case thickness, and lug width decide how the watch sits on your arm, and sellers often round up or skip those numbers. A caliper and two minutes give you the answer.
- Width across the case at 3 and 9 o'clock: should read 40mm, not 41 or 39
- Thickness: copies that hide an automatic rotor often run 12mm or more
- Lug width: 20mm straps should fit with no gap and no forcing
- Lug to lug: near 47mm, which is what makes or breaks the fit on a small wrist
- Weight: a steel Trésor copy should feel light for its size, not dense and chunky
Dial, hands, and case back checks
Dress watches live or die on the dial, because there is nothing else to look at. Print quality, marker alignment, and the date font are the three spots where cheap copies fail.
- Date window at 6 o'clock: the frame should be crisp and the numbers should sit centered
- Markers: applied metal, polished on top, seated straight against the dial
- Hands: slim, with a clean transition from polished to brushed finish
- Dial finish: a smooth sun-brushed or lacquer surface with no orange peel texture
- Case back: engraving that matches the reference in the listing, with sharp inner edges on the sapphire opening
- Crown: thin, with a logo that is stamped, not painted
Manual wind or automatic: the tell that matters
The real Trésor is hand wound, and that single fact trips up most copies. Automatic copies add a rotor, which pushes the case back out and changes both the thickness and the sound of the watch.
To test it, hold the watch near your ear and turn it. A rotor makes a soft sliding sound. A hand-wound movement stays silent and clicks as you wind the crown. Wind a manual copy 20 to 30 turns, feel for a stop at full power, and check that the crown does not wobble or grind.
Copied movements also skip the anti-magnetic build of the genuine calibre. Keep any copy away from phone speakers, tablets, and magnetic clasps.
Will a 40mm Trésor fit your wrist?
A 40mm dress watch with short lugs fits a 6.5-inch wrist, and often a 6-inch wrist too, because the case is thin and the lugs curve down. The risk is the lug-to-lug length, which lands near 47mm on this model.
Measure your wrist flat, then check the top of your wrist for overhang. If the lugs sit past the edges of your wrist, the watch will slide and the strap will crease at the buckle. A thin case hides width well, but lugs do not lie.
How to spot a weak Trésor copy
- Thick case back, which points to a rotor stuffed inside a dress case
- Printed markers or a date window with a plastic-looking frame
- Case back text that does not match the reference number on the listing
- Strap stitching that runs uneven or sits off-center
- Crown that grinds, wobbles, or refuses to seat when pushed in
- Seconds hand that stutters instead of sweeping in a smooth arc
Care rules for a copied dress watch
Treat a first copy like the dress watch it copies. Wind it at the same time each morning, keep it dry, and store it flat on a soft roll or in a case. Water resistance on the Trésor line covers rain and hand washing, not pools, showers, or the sea.
Get the movement serviced or swapped when it starts losing time. Copied hand-wound movements cost little to replace, and a watchmaker can do the work in a day. A leather strap lasts about a year with daily wear, so buy a spare 20mm strap in a neutral color.
FAQ
Does the replica use the same movement as the original?
No. The original uses a hand-wound Omega Master Chronometer calibre. Copies use budget hand-wound or automatic movements from other makers, often with a decorative plate or engraving on the bridges.
Can a watchmaker tell a first copy from the real thing?
Yes, on a bench. Thickness, winding feel, case back engraving, and movement finish all give it away within a minute, and a jeweler with a loupe will spot the dial print first.
Is a 40mm Trésor copy waterproof?
No. Splash resistance in a copy comes from a gasket that may not seat well, so keep it away from water. Even the genuine watch is rated for 30 metres, which covers rain and washing your hands.
How much should a first copy cost?
Prices move with the movement inside. Quartz builds sit at the bottom, basic automatics sit in the middle, and hand-wound copies with a decorated case back cost the most. Judge the watch by measurements and winding feel, not by the price tag alone.