Omega Seamaster Cosmic Ref. 166.026
Dress / Casual Watch (C-shape Tonneau Case) · Omega (Swatch Group), luxury watchmaker tier, renowned for precision and rich heritage
Period: Vintage (Late 1960s to Early 1970s)
Type
Dress / Casual Watch (C-shape Tonneau Case)
Brand
Omega (Swatch Group), luxury watchmaker tier, renowned for precision and rich heritage
Movement
Automatic self-winding, Omega Calibre 565, 24 jewels, 19,800 vph, with a quickset date function achieved by pulling the crown fully out
Dimensions
Case diameter approximately 35mm, thickness 11mm, lug-to-lug 38mm, lug width 18mm
Description
The Omega Seamaster Cosmic represents the bold aesthetic shifts of late-1960s watch design, combining a robust tool-watch heritage with elegant daily-wear aesthetics. Featuring a distinctive single-piece tonneau case and an eye-catching deep green sunburst dial, this piece delivers striking vintage wrist presence. Its automatic Calibre 565 is celebrated by collectors as one of Omega's most reliable and mechanically refined workhorse movements from the golden era of Swiss watchmaking.
Key Features
Monocoque case design requiring movement removal through the crystal, striking emerald green sunburst dial, Omega Calibre 565 with pull-crown quickset date mechanism, integrated case and bezel styling
Dial Description
Vibrant emerald green sunburst dial with applied silver baton hour markers featuring white inserts, matching baton hands with luminous inserts, and a framed date window at the 3 o'clock position
Case Material
Stainless steel, monocoque case construction with a combination of brushed top surfaces and polished bevels
Crystal Type
Acrylic crystal with central Omega logo etched and a tension ring
Bezel Details
Fixed smooth stainless steel bezel integrated into the monolithic case design
Crown & Pushers
Signed Omega crown, pull-out type integrated closely into the case flank
Bracelet or Strap
Green leather strap with white contrast stitching and a steel pin buckle
Caseback Details
Solid integrated monocoque caseback featuring the classic Seamaster Hippocampus (sea monster) logo embossed in the center
Movement Type
Automatic self-winding, Omega Calibre 565, 24 jewels, 19,800 vph, with a quickset date function achieved by pulling the crown fully out
Water Resistance
Originally rated to 30 meters (3 ATM), though vintage timepieces should not be exposed to water without contemporary pressure testing and fresh gasket replacement
Origin & Provenance
Swiss Made, manufactured in Bienne, Switzerland, featuring an in-house Omega mechanical automatic movement
Age Estimate
Circa 1968 to 1972
Cultural Significance
Embodies the transition era of watch design where traditional round dress watches gave way to futuristic, geometric shapes influenced by the Space Age and 1970s pop culture aesthetics
Condition Notes
Very Good vintage condition. The case shows minor surface wear consistent with age, the acrylic crystal exhibits light hair-line scratches easily buffed out, the green dial is pristine and unblemished, and the hands retain their original tritium luminous material
Value Estimate
Estimated secondary market value between $800 and $1,500 USD, heavily dependent on dial color rarity, original signed parts, and overall mechanical health
Care & Maintenance
Recommended service interval every 4 to 5 years by a vintage watch specialist. Avoid water exposure due to the age of the original case gaskets and acrylic crystal
Similar Watches
Omega Seamaster 300, Zenith Defy, Universal Genève White Shadow, Rolex Oysterquartz
Interesting Facts
The 'Cosmic' line was marketed by Omega as both waterproof and shockproof, utilizing a special front-loading case structure designed to minimize entry points for dust and moisture. The Calibre 565 movement is famous for its unique quickset date feature where repeatedly pulling the crown to the extreme position advances the date by one day.