Swiss nickel musical cylinder watch with visible balance Circa 1890

Nickel open faced musical watch
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A large and rare Swiss nickel open faced musical cylinder pocket watch with visible balance, circa 1890. Very rare musical movement, pinned barrel, Patent Brevete 8605, cylinder escapement. Two-coloured champlevé dial with Roman hours and blued steel hands. Plain case. Case and movement with matching numbers.
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Diameter: 66 mm
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Weight: 267 g
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Signed: No name