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Omega · Seamaster
166.091 is an Omega Seamaster 200 m / 660 ft reference, introduced in 1970.
The case is 40.6mm stainless steel.
It runs the Cal. 1002, an automatic movement.
It is the 5th of 25 Seamaster references in the catalogue by production start.
Full ref ST 166.091 SC; Piquerez 'Pilot-line' tonneau dive case, screwed case-back, black dial, orange centre-seconds hand, 60-min bidirectional bezel; per Antiquorum lot notes, Cal. 1002 (created 1968) was used for most Seamaster Professional watches of the era including the Ploprof.
The 166.091 was introduced in 1970.
The Omega 166.091 runs the Cal. 1002, an automatic movement.
Look up the watch's serial number in the Watch Safe registry to see whether a record exists or a theft flag is attached. A registry search identifies records for a specific serial; it does not authenticate the watch. Authentication is performed in person by an independent expert authenticator, and Watch Safe records and publishes the result.
Checking a specific Omega? Look up its serial number in the registry.