French platinum and sapphire split second chronograph Circa 1925

Platinum open faced lever
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A fine and extremely rare French, platinum and sapphire split second chronograph pocket watch, circa 1925. Very rare extra flat pocket watch in platinum and sapphire in a round open faced case. The case and bow are set with sapphires. Silver dial with Roman numerals, subdials for seconds and minutes and blued steel hands. Manual mechanical movement with column wheel and rattrapante function. Lever escapement. Signed dial.
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Diameter: 47 mm
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Weight: 71 g
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Signed: Cartier  Paris
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Cartier was founded by Louis-François Cartier. He was born in 1810. In 1847, Louis-François was able to take over the jewellery shop of his teacher Adolphe Picard at 31 Rue de Montreuil, Paris. It is a French jewellery house specialising in making very luxurious jewellery such as rings, bracelets, earrings, necklaces and watches.