Swiss keyless silver triangle shaped pocket watch Circa 1900

Silver watch with retrograde time indicator
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A rare Swiss Art Nouveau design watch with retrograde time indicator, circa 1900.
A Niello silver case with flower scroll ornaments and silver dome. Enamel dial with retrograde Roman hours, retrograde red and black Arabic minutes and blued spade hands. Frosted, gilt, triangle-shaped movement, “Brevet 27961”,  with screw compensation balance. Dial and movement signed.
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Dimensions: 60 x 71 mm
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Weight: 104 g
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Signed:  Sector Watch  Tramelan
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Swiss pocket watch, Sector watch
The Sector Watch has the shape of a segment of a circle. It was manufactured between 1903 and 1908 by the Record Watch company in Tramelan. The differently decorated cases, mostly decorated with Art Nouveau ornaments, were made by the Holy Frères company in Saint-Imier . The movement was a conventional lever escapement , the hour and minute hands jumped back to zero after each segment. Swiss patent 27961.