Observatory Chronometer A fine, heavy and large deck chronometer with 36h power...

Gehäuse
Steel, tiered, glazed movement.|Very good.

Zifferblatt
Enamel.|Very good.

Werk
Bridge movement with center bridge, lever escapement, Guillaume gold screw compensation balance.|Very good, capable of running, cleaning recommended.

WERKNR:4380425

caliber:26.99

dimension:69 mm

circa:1925

weight:253

country:Switzerland

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This Longines chronometer movement took part in the National Physical Laboratory’s Teddington "Kew - Class A" chronometer competition in 1931, achieving a score of 93.2 points and being awarded the rating "especially good".Calibre 26.99 exists in one version as a bridge movement and in another with a central bridge, and it is reserved exclusively for use in the observatory competitions. While obtaining a coveted bulletin was initially pursued by LONGINES with a primarily commercial motivation, the company’s attitude toward the competitions shifted in the early 1920s toward a performance- driven participation, aiming for prizes and records that could strengthen the marketing of its commercial products. As a result, Calibre 26.99 remained exclusively within the regulation department, which submitted it to the observatory trials.Because of the larger dimensions of the movement, both the Guillaume balance and the mainspring barrel were enlarged accordingly. However, submissions in Neuchâtel are limited and focus mainly on the years 1924 and 1925. In Geneva, the calibre is entered until 1929.Source: ChronoHype Magazin No. 16