Swiss graduate’s piece with spring detent escapement Circa 1925

Nickel open faced pocket watch by Watchmaking school Le Locle
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A rare, large Swiss graduate’s piece with spring detent escapement, circa 1925.
Nickel case, glazed on both sides. Enamel dial with radial Roman hours, auxiliary seconds and blued spade hands. Bridge movement, rhodium plated and ground, with Guillaume gold/platinum screw balance.
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Diameter: 54 mm
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Weight: 159 g
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Signed: Watchmaking school Le Locle