Heuer Calculator NOS*** Rare Black Dial*** 1981
HEUER Calculator Rare Black Dial, Mint Condition, Calibre 12, 1981
Serial: 39XXXX
Circa: 1981
Reference No.: 110.633 N

CASE: 46mm mint stainless steel, crown at 9 o’clock and pushers on the right side with slide rule, Glass in acrylic

MOVEMENT: Caliber 12, Self-winding mechanical. Hours, minutes, seconds, chronograph and date, 17 jewels

DIAL: Black dial with orange accents, date indication at 6 0‘clock

BRACELET: Original Heuer stainless steel link bracelet

CONDITION REPORT: Mint 'New Old Stock' condition

NOTES: The 1960’s saw the race towards the development of the first automatic chronograph movement. Two groups were in contention for this feat: Movado/Zenith versus Heuer/Breitling/Hamilton/Dubois Depraz. The Caliber 11 was released just ahead of its competitor in March 1969 and became the first iconic automatic chronograph in the world. The amalgamations that lead to its success therefore benefited from the same caliber fitted into Breitling, Heuer-Leonidas and Hamilton-Buren. This caliber became the base workhorse for the next 40 years to follow including its successor the Caliber 11-I and then the Caliber 12 to finally Caliber 15.
The Heuer Calculator is an extra large 46mm ‘Slide Rule’ watch developed in the 1970’s by Heuer for pilots (much like the Breitling Navitimer).