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Parthian Watch Company

Omega Tissot, Caliber 33.3 Mono-pusher Chronograph, Rare Oversized Stepped Case, 1930s

Omega Tissot, Caliber 33.3 Mono-pusher Chronograph, Rare Oversized Stepped Case, 1930s

Regular price $23,500.00
Regular price Sale price $23,500.00
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This is an excellent Omega (co-branded Tissot) chronograph, featuring the famed Caliber 33.3 movement. The triple-step lunette case measures 40 mm in diameter, the largest case that Omega offered at that time. The combination of the case design, unique aviator-style crown with a mono-pusher chronograph, and the silver gilt snail dial co-branded with Tissot puts this watch into the almost unique category.

The Co-branded Gilt Dial

The dial is glossy black lacquer with silver gilt Arabic numerals and an outer Telemeter scale. The dial features blackened steel leaf-shaped aviator hands. The dial is co-branded Tissot which adds to the rarity and desirability of this piece.

In 1930, Omega and Tissot merged, with the aim of manufacturing high-quality Swiss watches for a more diverse group of customers. Omega was asked to focus on engineering innovations and to maintain its position in the high horology segment, whereas Tissot would serve the medium market. Subsequently, in 1932 Omega bought Lemania, a Swiss specialist in the manufacture of high-quality chronograph movements.

Caliber 33.3 Movement

To vintage watch aficionados, the Omega 33.3 represents one of the finest chronograph movements of all time. The caliber was initially developed in late 1920s as the 13’’’ Lingne movement by Lemania and named caliber 28.9. It is also known as Lemania 13CH. It is a highly advanced, accurate, and reliable column-wheel movement. In a column-wheel configuration, a vertical clutch lifts the gears up from the movement, allowing a precise and smooth action to engage the chronograph.

The base Lemania movement was modified by Omega in 1933 and renamed Caliber 33.3 after the year the breakthrough was made. To this day, Cal 33.3 is considered one of Omega’s finest movements. However, because of the time and expense required to produce them, only 13,700 were made from 1933 to 1952. These movements did not enjoy the benefits of waterproof cases, so to find them with all original parts without tarnish and discoloration is a feat.

In the early 1940s, with the addition of shock absorbers and anti-magnetic properties, Caliber 33.3 gradually evolved into the Omega Caliber 321. Among its other achievements, Caliber 321 became famous as the engine of the Speedmaster that travelled to the moon with the NASA astronauts.

Condition Report

The condition of this watch is excellent. The case is untouched with sharp edges. The dial is also original and unrestored. There is some very minor wear to the outmost edges of the dial on the Telemeter Scale, which is consistent with the 90-year age of the watch and enhances the original beauty of this timepiece.

Signed: Case, dial and movement signed.

Case Diameter: 40 mm

Thickness: 13 mm

 Waterproof: No

Technical Data

Movement: Caliber 33.3

Jewels: 17

Frequency: 18,000 VpH

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