The Omega Seamaster Cosmic reference 166.036 is a vintage automatic wristwatch introduced by Omega in 1967. It belongs to the Seamaster line and represents a classic mid-century combination of dress and sports watch aesthetics.

The watch features a stainless steel case measuring approximately 35–36 mm in diameter. Its most distinctive element is the one-piece Unishell construction, which is opened from the dial side rather than the caseback, providing enhanced water resistance rated to 30 meters. The case has a slim profile, a satin-finished bezel, and polished sides, giving it an elegant yet understated appearance.

It is powered by the Omega Caliber 752 (or the closely related Caliber 762 in some examples), a reliable automatic movement that beats at 19,800 vibrations per hour. Many examples are chronometer-rated, and the movement includes quick-set day and date complications displayed at the 3 o’clock position.

Dials are typically two-tone or silvery gray, featuring applied indexes, luminous hands, and the characteristic Seamaster Cosmic branding. The watch is fitted with a plexiglass crystal, which in some cases includes an internal cyclops-style magnifier over the date window.

Produced primarily from the late 1960s to the early 1970s, the 166.036 remains a sought-after model among collectors for its clean design, solid build quality, and historical significance within Omega’s Seamaster collection.

Specifications
 
Year: 
1970s

Contents:
 Watch, box & papers 

Reference: 
166.036

Case size: 
35mm

With crown: 
38mm

Movement:
 Automatic Cal 752

Crystal:
 Acrylic

Wrist circumference: 19.5cm
 

Condition
 
Dial

The dial has watermarks throughout the dial however it’s not too tragic, the beautiful sunburst effect is still popping

Bezel 

The bezel has some age related marks 

Case

The case is sharp however it does show age related marks and scuffs 

Case back 

The case back is in a good condition, does show age 

Movement
 
The movement runs within +/-15 seconds per day

Strap 

The iconic BoR bracelet is in a very good shape, minor stretch and scuffs for age

Crystal

 The crystal is in a good condition with minor scuffs when inspected closely