Omega Speedmaster Calendar– Ref 3336.20 with caliber 1150 - 1991

Omega Speedmaster with reference 3336.20 with white round dial and Roman numerals for hours, 3 sub dials for hours and moon phase at 6 o’clock, GMT and seconds at 9 o’clock and minutes at 12 o’clock with calendar day and month. There is an outer ring for the date.  The hands are blue and gold with baton shape. It is a Swiss Made model. The bezel graduated up to 500, pushers and crown are in gold. The crown has the Omega logo. The watch comes with a steel back case with engraved “Omega Maison Fondee en 1848 - 53659458. The watch has an automatic movement with caliber Omega 1150 and 25 jewels. The watch comes with a brown strap and buckle. The watch comes with an Omega service box.

History

The story of Omega started in 1848 with Louis Brandt when he opened a “Comptoir d’etablissement” a sales office for sub-contracted watch manufacture. In 1880, the brothers Louis Paul and Cesar Brandt set-up a modern watch production unit. In 1889, the company had a production of 100,000 units per year. The name of Omega only appeared in 1903. Omega has developed amazing movements such as the “Labrador” in 1885. In 1917, Omega provided watches to the British army and in 1918 to the American army. In 1957, the speedmaster professional was born and then selected by the NASA in 1965 as the official timekeeper. Today, Omega continues to demonstrate mechanical innovation and remain one of the most prominent brands in the world of watchmakers.

Technical details

Automatic movement with caliber Omega 1150 with 25 jewels, 28,800 A/h and with 42 hours of power reserve. (It is based on the Valjoux 7751).

Measurements

Diameter excluding winding crown: 39mm


Length including lugs: 44mm