Heuer, a gentleman's gold triple calendar chronograph wristwatch, 1950's,

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Heuer, a gentleman's gold triple calendar chronograph wristwatch, 1950's,
18k, gilt dial with gilt dot markers, subsidiary constant seconds, minute and hour recording dials, day and month apertures, outer date ring, 17-jewel movement numbered 500525, compensation balance, case with snap on back, dial, movement and case signed, diameter 35mm.
See Illustration (Plate 15)