Omega

De Ville Tresor

Name: Omega De Ville Tresor 435.53.40.21.02.001
Brand: Omega
SKU: 435.53.40.21.02.001

Ref. 435.53.40.21.02.001

2017–present · 40mm · caliber Omega Cal. 8912: Co-Axial Master Chronometer, manual-wind, 25,200bph, 60h PR, 32j; METAS-certified, anti-magnetic to 15,000 gauss; ultra-thin 3.98mm profile

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In-house manufacture caliber · caliber Omega Cal. 8912: Co-Axial Master Chronometer, manual-wind, 25,200bph, 60h PR, 32j; METAS-certified, anti-magnetic to 15,000 gauss; ultra-thin 3.98mm profile · 60h power reserve (2.5 days)

Medium-large: suits wrists 6.5 in+ (16.5 cm+)

40 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.

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Authentication

The De Ville Tresor uses a manual-wind Cal. 8912 with no automatic rotor; any Tresor caseback showing a rotor has a movement swap and is a disqualifying find.

Known issues in the market

Movement swaps to automatic Cal. 8500 or similar are the primary fraud vector; the Tresor caseback must show no rotor.
Cal. 8912 is METAS-certified; the METAS stamp must appear on the caseback alongside the Master Chronometer designation.
The small winding crown at 3 is the only crown; any Tresor with a crown at 9 or additional crown positions is incorrect.

Area	What to check	What is correct	Red flag
caseback	Manual-wind movement, no rotor	Cal. 8912 manual-wind movement visible through caseback with no automatic rotor present	Any rotor visible through the caseback; a rotor indicates an automatic movement swap
caseback	METAS certification stamp	METAS logo and Master Chronometer designation engraved on caseback	No METAS stamp; caseback with only COSC or no certification mark
crown	Crown position and function	Single winding crown at 3, winds the mainspring with smooth increasing resistance, no crown at 9	Crown at 9 position; any crown layout other than single crown at 3

Common legitimate replacements

Manual-wind movements are occasionally swapped to automatic movements on serviced examples; caseback inspection is mandatory.
The slim profile of the Tresor is incompatible with most aftermarket straps; confirm the strap is sized correctly for the Tresor lug width.

Expert resources: Omega.com De Ville Tresor documentation. Omega Forums for Cal. 8912 manual-wind identification and METAS caseback stamp comparison.

Authentication guide

Last reviewed June 2026

The De Ville Trésor is Omega's ultra-thin dress watch at 8.35mm case height, using the manual-wind cal. 8912 Co-Axial Master Chronometer. Roman numeral dial with no date. The extreme thinness is the defining characteristic -- any watch at this price point claiming to be a Trésor should have the case height measured against specification.

Known reproduction risks

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LOW

Case height not matching the 8.35mm specification

Case appears thicker than ultra-thin specification when viewed from the side
Caliper measurement shows case height significantly above 8.35mm

The De Ville Trésor is not a high-volume fake target. The ultra-thin case height is a measurable specification -- a simple caliper eliminates most case-thickness concerns.

LOW

Automatic movement substituted for manual-wind

Watch winds automatically without crown engagement -- the Trésor is manual-wind only
Crown at 3 o'clock does not advance a mainspring progressively when turned

Dial variants by era

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Era	Description	Identifiers
2017 to present (cal. 8912)	Slim 40mm round case at 8.35mm height. Roman numeral dial in silver, champagne, or black. Leaf-style hands. Leather strap only -- no bracelet option on the standard Trésor. Manual-wind only. The ultra-thin profile is the defining design statement.	Roman numeral chapter ring -- same as the heritage dress watch tradition Leaf-shaped hour and minute hands Ultra-thin case: 8.35mm height, measurable with a simple caliper No date window -- the Trésor is time-only Leather strap only -- no bracelet "Co-Axial Master Chronometer" and "Manual Wind" designation on dial or caseback

Service part flags

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Case height

Original: The 8.35mm case height is a measurable specification. An ultra-thin watch at this price point claiming to be a Trésor should measure within normal manufacturing tolerance of 8.35mm. A case that measures significantly thicker has either had components replaced or is not the stated reference.

Replacement tells

Case height measurably thicker than 8.35mm when measured at the case band with calipers
Case profile appears chunky or non-thin when compared to published reference images

Caliber 8912

Original: Cal. 8912 is manual-wind, Co-Axial Master Chronometer, with a 60-hour power reserve at 25,200bph. The caliber is exceptionally thin at 3.98mm. Manual winding via the crown at 3 o'clock with progressive resistance.

Replacement tells

Crown turns with no progressive resistance from a run-down state -- a manual movement with a broken mainspring or ratchet
Watch winds automatically -- the Trésor cal. 8912 is manual-wind only
Caseback shows a different caliber number than 8912

Leaf hands

Original: Leaf-shaped hour and minute hands -- wide at the pivot, tapering to a point. Polished to a mirror finish. The hand finish should be consistent with the case finish.

Replacement tells

Baton or dauphine hands where leaf hands should be -- indicates a hand swap
Hand finish matte where mirror is expected
Hand geometry inconsistent with the specific leaf profile for this reference

Case back markings

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2017 to present

Caliber 8912 designation
"CO-AXIAL MASTER CHRONOMETER" text
"30 M / 100 FT" water resistance
Case reference and serial number
"OMEGA" and "SWISS MADE"
Solid caseback with engraved decoration on some variants

Movement tells

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Cal. 8912 is manual-wind -- wind progressively from a run-down state and confirm resistance builds correctly. Full winding should feel firm. Power reserve is 60 hours from a fully wound state.
At 25,200bph the seconds hand has a smooth sweep. The ultra-thin case means the movement is extremely sensitive to shock. A watch that has been dropped may show timekeeping irregularity without visible case damage.
The Co-Axial escapement in an ultra-thin manual-wind is a technically complex achievement. Any service should be performed by a watchmaker with Omega movement training -- thin movements are more prone to damage from incorrect tool use.

Sources: Omega De Ville official; Monochrome De Ville Trésor review.