Swiss minute repeating lever with transparent dial Circa 1940

Gilt-brass minute repeater
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A Swiss gilt-brass minute repeating keyless lever pocket watch with a transparent dial, circa 1940. Rhodium-plated movement by A. Lugrin made in 1889, 29 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator, repeating on gongs activated by a slide on the band. Transparent plexiglass dial with applied gilt dot indexes and Arabic quarter-hour numerals, original gilt baton hands. Polished case, transparent back. Movement signed under the hour hammer.
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Diameter: 54.9 mm
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Signed: Technicum Le Locle Ecole d’Horlogerie
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This watch was made by a student at the Technicum Le Locle horological school using the movement by Lugrin as the basis for building the watch.