Extremely rare Swiss gold square lever coin watch Circa 1910

Gold square shaped coin watch by Omega
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A Swiss 18 carat gold square coin watch, circa 1910. Retailed by D. Ladislas Tunis. Gilt lever movement. White enamel dial with Roman hours and Arabic minutes, one hand replaced. Very rare square shaped case, back lid in the shape of a coin/medal, signed Louis Bottes. Cuvette inscribed: Omega Grand Prix Paris 1900. Dial signed by watchmaker and retailer, movement signed by watchmaker, case numbered.
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Dimensions: 49 x 49 mm
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Weight: 91 g
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Signed: Omega – D. Ladislas Tunis