Swiss platinum chronograph with register Circa 1925

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A Swiss platinum open faced split chronograph keyless pocket watch with register, circa 1925. Nickel lever movement, 27 jewels, precision regulation. Silvered dial, Breguet numerals, blued steel moon hands, subsidiary dials for constant seconds and 30-minute register, outer track calibrated for chronograph. Polished case. Case, dial and movement signed.
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