What’s Included

• Later generic stainless steel bracelet

• 12-month warranty

• Insured next-day delivery or collection from Mayfair, London

Omega Seamaster Cosmic 166.137 | 39mm | Early 1970s | Automatic Cal. 1010

This is an original Omega Seamaster Cosmic Ref. 166.137 from the early 1970s, presented in excellent all-round condition. With its distinctive modular case design, this reference was created for durability in pressurised environments and remains a fascinating dive-inspired watch from Omega’s heritage.

The 39mm stainless steel case is fitted with a rotating bezel featuring its original black insert — remarkably well preserved given its 50+ years of age, showing only light wear with no major chips or dents.

The dial and hands are completely original, displaying an attractive natural patina that enhances its vintage character. Importantly, there are no signs of moisture damage, and the lume still functions. An Omega-signed crown completes the case.

At its heart beats the legendary Omega Calibre 1010 automatic movement, running at approximately –10 seconds per day. While we pressure-tested the watch to 30m, it was originally designed for 60m water resistance, reflecting Omega’s engineering excellence of the period.

Condition

• Case: Very good, sharp edges with light wear consistent with age

• Bezel: Original black insert, aged but intact with no major chips or dents

• Dial: Original, with beautiful natural patina and functional lume

• Hands: Original, consistent ageing, no damage

• Crystal: Excellent, clean and clear

• Movement: Cal. 1010 automatic, running well at approx. –10s/day

• Bracelet: Generic later replacement (non-Omega)

Key Details

• Model: Omega Seamaster Cosmic

• Reference: 166.137

• Year: Early 1970s

• Case Size: 39mm stainless steel

• Bezel: Rotating with black insert (original)

• Dial: Original, patinated with luminous markers

• Hands: Original, matching lume

• Crystal: Acrylic (excellent condition)

• Crown: Omega signed

• Movement: Omega Calibre 1010, automatic

• Bracelet: Later generic stainless steel bracelet

• Water Resistance: Tested to 30m (originally rated 60m)

Our View

The Omega Seamaster Cosmic 166.137 is an underrated vintage diver with strong collector appeal thanks to its distinctive modular case, patinated original dial, and legendary Cal. 1010 movement. While fitted with a later replacement bracelet, all other key elements remain intact, making this a superb example of the reference. A watch that balances vintage charm with robust engineering — and at a highly accessible entry point into vintage Omega collecting.