Large Swiss silver lever chronometer deck watch Circa 1919

Silver watch made in a limited edition 
–
A very fine and rare Swiss, large, silver, keyless deck lever chronometer with Guillaume balance, circa 1919. Chronomètre de Bord I.C.S.T. Min. 574, Observatory by Omega. Made in a limited edition of 66 examples in 1919. A polished, hinged silver cuvette, the back cover inscribed I.C.S.T. Min. 574. Matte silvered dial, painted Arabic numerals, outer minute track, large subsidiary seconds. Blued steel spade hands. Observatory, frosted gilt movement, 21 jewels, large going barrel, straight-line lever escapement, Anibal-brass Guillaume balance with gold and platinum screws, blued steel Breguet balance spring, sapphire endstone, swan-neck micrometre regulator. Dial, case, cuvette and movement signed.
–
Diameter: 60 mm
–
Signed: Omega  Swiss
–
The 21 Observatory and Marine Chronometer Calibers
These calibres allowed Omega to attain the ranks of the highest achievers in Observatory timing contests; they were also used in the 1st class chronometers offered to the general public. The present watch is from a series of 66. Chronomètres de Bord Observatoire produced in 1919 and comprising numbers 5337836 through 5337901. This watch was sold to the Swedish military on November 15, 1943, and was one of three watches specially ordered with a silvered dial. It is highly likely that it passed through an Observatory timing competition, due to the fact that the movement is numbered both on a bridge and on the pillar plate beneath the balance.