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The Encyclopedia of Horology

Wristwatch · Manual-wind wristwatch

Omega Seamaster Caliber 285

Partially verified

This vintage Omega Seamaster wristwatch is dated to approximately 1960. The watch features a stainless steel case with a diameter of 34 mm and a screw-down case back adorned with the company's signature seahorse emblem. It houses an Omega Caliber 285 manual-wind movement with 17 jewels. The black dial has been professionally refinished and is set with gold-colored hour markers, Arabic numerals at the cardinal points, and gold-colored hands. A central seconds hand is also gold-toned. The watch is presented on a black crocodile-patterned calf leather strap with an Omega-signed buckle. The watch has been serviced according to the source information and is currently in operational condition. The exterior metal surfaces display minor scratching consistent with age and use.

Front view of the vintage Omega Seamaster wristwatch showing the black refinished dial and gold-toned indices.
Front view of the vintage Omega Seamaster wristwatch showing the black refinished dial and gold-toned indices. — Ashton-Blakey Antiques. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
zamanito.com
Category
Wristwatch · Manual-wind wristwatch
Maker / attribution
OMEGA
Reference
Not recorded
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
circa 1960
Source-reported place
Switzerland

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case and Dial

The watch is housed in a 34 mm stainless steel case. The design includes fixed lugs and a polished finish. The screw-down case back is embossed with the Seamaster seahorse emblem, identifying it as part of the established Seamaster collection. The case shows minor surface wear from previous use.

The dial is black and has undergone a professional refinishing process. It features gold-colored indices and gold-colored Arabic numerals at the 3, 6, 9, and 12 o'clock positions. The handset, including the central seconds hand, is finished in a matching gold tone to complement the markers. The dial displays the Omega brand name below the 12 o'clock position and the Seamaster model name above the 6 o'clock position.

Evidence for this section
  • “قاب ساعت از جنس استیل ضدزنگ با قطر ۳۴ میلی‌متر ساخته شده”
  • “درب پشتی پیچی منقش به نشان اسب دریایی (Seahorse) معروف این سری است.”
  • “صفحه مشکی ساعت طبق منبع به صورت حرفه‌ای بازسازی شده”

Movement and Function

The timepiece is powered by the manual-wind Omega Caliber 285. This movement is a derivation of the 30-series calibers and contains 17 jewels. The mechanism is designed for manual winding via the signed crown.

According to the provided documentation, the movement has been recently serviced and functions accurately.

Evidence for this section
  • “پیشرانه این ساعت کالیبر ۲۸۵ دستی کوکی با ۱۷ سنگ قیمتی است.”
  • “طبق توضیحات منبع، این ساعت اخیراً سرویس شده و در وضعیت کارکرد دقیق و مناسبی قرار دارد.”

Provenance and Documentation

This watch is identified as an Omega Seamaster originating from approximately 1960. The documentation for the object is provided by Ashton-Blakey Antiques via a catalogue record.

The seller indicates that all internal and external parts have been reviewed as part of the refinishing and service process, though no independent verification of these claims is offered by the listing source.

Evidence for this section
  • “این ساعت مچی وینتیج OMEGA Seamaster نمونه‌ای کلاسیک از تولیدات اُمگا در حدود سال ۱۹۶۰ میلادی است.”
  • “کلیه مشخصات، اصالت قطعات بازسازی‌شده و جزئیات فنی ذکرشده صرفاً بر پایه داده‌های اعلام‌شده توسط فروشنده درج گردیده است”

Open research questions

  • What is the specific production year for this movement serial range?
  • To what extent did the professional refinishing affect the original dial markings and indices?

Source evidence

Recorded claims and source quotations for Omega Seamaster Caliber 285
FieldSource-reported valueSource quotation
MakerOMEGA“برند سازنده: اُمگا (OMEGA)”
MovementCaliber 285 manual-wind“پیشرانه این ساعت کالیبر ۲۸۵ دستی کوکی با ۱۷ سنگ قیمتی است.”
Case diameter34 mm“قاب ساعت از جنس استیل ضدزنگ با قطر ۳۴ میلی‌متر ساخته شده”
DialBlack, professionally refinished“صفحه مشکی ساعت طبق منبع به صورت حرفه‌ای بازسازی شده”
Case backScrew-down with seahorse emblem“درب پشتی پیچی منقش به نشان اسب دریایی (Seahorse) معروف این سری است.”
StrapBlack crocodile-patterned calf leather with Omega buckle“یک بند چرم گوساله با طرح تمساح مشکی به همراه سگک دارای نشان OMEGA روی آن قرار گرفته است.”
Service statusServiced“طبق توضیحات منبع، این ساعت اخیراً سرویس شده و در وضعیت کارکرد دقیق و مناسبی قرار دارد.”

Visible details

  • Case back features the Seamaster seahorse motif
  • Crown is signed with the Omega logo
  • Dial includes applied gold-colored Arabic numerals at 3, 6, 9, and 12 o'clock
  • Hands are gold-colored

Research qualifications

  • The source explicitly notes that the dial is professionally refinished
  • The auction house states that all specifications regarding parts and restoration are based solely on information provided by the seller, and they offer no independent guarantee of authenticity for the components

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

ساعت مچی وینتیج OMEGA Seamaster کالیبر 285 کوکی دستی

Reviewed 2026-11-02 · Record 3de874fd0c

Terms in this record

Glossary explanations for terms named in this object’s record.

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