Only Online Auction

Geneva, Dec 08, 2022

LOT 240

Ref. ST 166.091 SC, diver’s, self-winding, centre-seconds, date; “Seamaster 120 m / 400 ft”; stainless steel

CHF 1,200 - 2,400

EUR 1,250 - 2,500 / USD 1,300 - 2,600 / HKD 10,000 - 19,900

Stainless steel, self-winding, “tonneau”-shaped, massive diver’s wristwatch, water-resistant with screwed case-back, pilot’s case, 60-minute graduated bidirectional revolving bezel with black insertfor the decompression times, black dial with radial luminescent indexes, centre-seconds and one horological complication:
· Half-instantaneous date of the month (aperture at 3 o’clock)

Grading System
Grade: AA

Very good

Case: 3-8


Slightly scratched

Movement: 3*


Overhaul recommended, at buyer's expense

Dial: 3-01


HANDS Original

Brand Omega, Bienne / Biel

Model “Seamaster 120 m / 400 ft”

Reference ST 166.091SC

Year circa 1970

Movement No. 33 145 421

Case No. unnumbered

Material stainless steel

Bracelet black rubber strap

Buckle stainless steel buckle

Diameter 40.6 mm. (bezel)

Caliber 1002, 20 jewels

Dimensions 51.9 x 41.2 mm.

Weight 107 gr. (approx.)

Signature dial, case and movement

Accessories copy of the invention patent


Omega, Ref. ST 166.091 SC

Production of this reference started in 1970.


Omega, Cal. 1002

Created in 1968, it was used for the majority of the “Seamaster Professional” watches from that date, including the “Ploprof”.


Case based on the Swiss invention patent No. 487 449, delivered on March 15, 1970 (application filed on February 24, 1967), to Ervin Piquerez, Bassecourt (Bernese Jura), for a “Procédé de fabrication d’une boîte de montre étanche et dispositif pour la mise en œuvre de ce procédé” (Method of manufacturing a water-resistant watch-case and device for carrying out this method).