Heavy Swiss silver open faced ankerchronometer Circa 1972

Silver masterpiece ankerchronometer
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A large and heavy silver open faced school ankerchronometer from the La Chaux-de-Fonds Watchmaking School, circa 1972. Glazed ½ plate movement with a large Guillaume gold screw compensation balance. Silver plated dial with Roman hours, an outer minute track, sunk subsidiary seconds at 6 o’clock and spade & whip hands. The plain case is screwed on both sides. Movement signed and numbered.
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Diameter: 60 mm
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Weight: 215 g
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Signed: Technicum La Chaux-de-Fonds