Large Swiss open faced chromed chronometer Circa 1927

Chromed observatory chronometer
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A large Swiss chromed open faced observation chronometer made by Omega, circa 1927. The ½ plate movement with a Guillaume gold screw compensation balance and blued balance spring with end curves on both sides. White enamel dial with Arabic hour numerals, an outer minute track, sunk subsidiary seconds at 6 o’clock and blued spade hands. A plain case. Dial signed, movement signed and numbered.
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Signed: Ω Omega
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Diameter: 75 mm
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Weight: 287 g
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This timepiece comes from a small series of 88 examples, produced between 1925 and 1930, that were intended exclusively for precision competitions, but the present example is one of the few clockworks of this type that does not appear in the result lists.
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As said, the Omega chronometer Cal. 60.8 mm was intended exclusively for precision competitions. This very large caliber hardly achieved better results than the 47.7 mm caliber. The observatory caliber, which was constructed taking into account all known knowledge and experience, still has some remarkable properties, even if all the functional reliability necessary in a watch for everyday use is omitted.