Fine keyless minute-repeating gold Swiss pocket watch Circa 1910

Keyless minute-repeating gold pocket watch
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A fine, keyless, minute-repeating, 18 carat gold pocket watch. Made by A. Lugrin Circa 1910.
Four-body, bassine, solid and polished case. Hinged gold cuvette.
White enamel with Breguet numerals, outer minute divisions, and subsidiary seconds. Blued steel spade hands.
Matte gilt movement with 15 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 and a centrifugal governor.
Movement signed under the hour hammer.
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Diameter: 51 mm
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Signed: A. Lugrin