Heuer - A rare and historically interesting 18k gold automatic calendar chronograph wristwatch

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Carrera, Ref:1158 CHN, Case No.249226, Circa 1972
17-jewel Cal.12 automatic movement with micro-rotor, brushed champagne dial with applied gilt baton hour markers with black accents and luminous tips, black outer 1/5th second divisions, raised outer tachymeter scale, gilt baton hands with black accents and luminous inserts, centre chronograph hand, black subsidiary dials at 3 and 9 for 30 minute and 12 hour recording, date aperture at 6, brushed and polished tonneau shaped case with screw down back, back engraved 'Arturo Merzario, per una eccelente collaborazione, J W Heuer', crown at 9, twin fluted chronograph pushers at 2 and 4, fitted brown leather strap with signed plated buckle, case, dial and movement signed