The Rare Omega Seamaster Chronomètre Automatic Ref. OT 2520

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 The Omega Seamaster Chronomètre Automatic Ref. OT 2520 is an exceptionally rare and collectible watch, especially among vintage Omega enthusiasts. Here's a detailed breakdown of what makes this reference special:

Omega Seamaster Chronomètre Ref. OT 2520 — Overview

  • Reference: OT 2520

  • Case: Solid 18k yellow gold, 34.5mm diameter

  • Movement: Caliber 352 RG, automatic bumper rotor, chronometer-rated

  • Dial: Typically features a silver or champagne dial, applied gold indices, and dauphine hands

  • Date: No date — time only

  • Production period: Early 1950s

  • Water resistance: As part of the Seamaster line, it had moderate water resistance for its time, though not a diver

Movement: Cal. 352 RG (Chronomètre Grade)

  • The "RG" designation: Refers to a regulator-type fine adjustment (rare and high-end)

  • Bumper automatic: Rotor oscillates with a "bumping" action — an early form of automatic winding

  • Chronometer-certified: Indicates superior timekeeping standards for the era

  • Jewels: 17–18 depending on version

  • Finishing: Higher-grade finishing than standard Seamaster movements

Omega Seamaster Chronomètre Automatic Ref. OT 2520 Enamel Dial


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