Short answer
The 40mm De Ville Trésor is a thin, understated dress watch, and that thinness is exactly what makes it hard to copy well. Most fakes get the dial layout and the lug shape close enough. They lose on case thickness, hand finishing, and the movement behind the caseback. That is where I would spend my attention if I were buying one.
What the real watch is working with
Omega builds the 40mm Trésor in stainless steel with a slim profile, a narrow polished bezel, and lugs that taper hard toward the strap. The case is roughly 10.5 to 11mm thick on the genuine, and the whole point of the design is that it slides under a cuff. Dials are sun-brushed or lacquered depending on the reference, with applied indexes, leaf-shaped hands, and a date or small seconds at 6 o'clock, again depending on the version. Inside is a co-axial Master Chronometer automatic, which is certified by METAS for rate and magnetic resistance.
That last part matters. A Master Chronometer certificate is not something a replica factory can replicate. It is a testing standard, not a badge you print on a caseback.
The three things that decide quality
1. Case thickness and profile
This is the first thing I check and the easiest thing to spot in photos. A rep that measures 12mm or 13mm is not a Trésor, it is a Trésor-shaped object with a thicker midcase. Ask for caliper photos from the side, not just straight-on shots. Look at how the lugs meet the case, too. On the genuine, that transition is a smooth polished flow. On cheaper fakes you get a visible seam or a slightly bulbous lug tip.
2. Dial print and hand finishing
The printing on a good fake is sharp under a loupe. On a bad one, the font is slightly too bold, the letter spacing drifts, and the applied logo sits a hair off-center. Leaf hands are where reps cut corners: genuine hands have crisp beveled edges that catch light along the full length. Cheap ones look flat and painted. Also check the date window if the model has one. It should be cleanly cut, not stamped with rough edges, and the disc should sit flush.
3. Movement and caseback
Most replicas run a Miyota 9015 or an A2824 clone, both of which beat at 28,800 vibrations per hour. The genuine co-axial calibre beats at 25,200, which is slower and audible if you hold it to your ear. That is a real tell. Below that, look at the rotor decoration and the engraving quality. Top-tier reps use a decorated rotor with correct text. Budget reps often ship with a solid caseback to hide an undecorated movement, which is a giveaway on a watch that should have an exhibition back.
Price tiers, honestly
- Under $150: wrong thickness, generic movement, soft printing. Fine if you just want the look from across a room.
- $250 to $400: the sweet spot. Correct dimensions, sapphire crystal, decent dial print, 9015 inside. This is what most people should buy.
- $500 and up: near-correct thickness, better hand polishing, cloned movement with proper engraving. Diminishing returns unless you handle it daily.
Inspection checklist
- Measure the case thickness with calipers, side-on.
- Check lug-to-case transition for seams.
- Loupe the dial text and the applied logo placement.
- Feel the crown action and check the Omega symbol depth.
- Listen to the beat rate, or have a watchmaker time it on a machine.
- Confirm the crystal is sapphire, not mineral.
- Check the strap for real alligator grain and a signed deployant.
Who this watch is for
The Trésor is a quiet watch. It does not shout, which means a replica gets you most of the way there in normal conversation. If you wear it to dinner and take it off at night, a mid-tier fake will pass. If you plan to hand it to someone who owns real Omegas, the thickness and the beat rate will give it away. Buy accordingly.