Heuer Calculator

Calculator is a wristwatch by Heuer.

Sports chronograph by Heuer (now: TAG Heuer), 1971 launched, with slide rule bezel and a for its time unusually large housing of 45.5 mm diameter. The watch was equipped with the automatic chronograph calibre Chronomatic with microrotor, first produced in 1969. Its typical, construction mark is the left sided crown, located at 9 h.