Heuer, a gentleman's stainless steel triple calendar chronograph wristwatch, 1960's,

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Heuer, a gentleman's stainless steel triple calendar chronograph wristwatch, 1960's,
silvered dial signed Heuer, day and month apertures, outer date ring, subsidiary constant seconds, minute and hour recording dials, polished case with snap on back, diameter 35mm.
See Colour Illustration (Plate 6)