Heuer Calculator

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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.

Reference:

110.633, Calibre 12, dark blue dial
150.633, Calibre 15, dark blue dial
740.633, dark blue dial (1974)
11633 MHT: Tachymeter (fixed), slide rule, black dial (1977)

Movement:

Self-winding chronograph movement Calibre Heuer 12 (later: Heuer 15), 21,600 A/h
Incabloc shock protection
17 jewels
Power reserve 45 h

Case:

Stainless steel
Ø 45.5 mm, H 15.5 mm
Mineral glass
Crown at 9 h
Screw-in back
Waterproof to 10 atm

Dial:

Dark blue (11633 MHT: black)
Two totalisers
Indices and hands with luminous material tritium

Functions:

Hours, minutes
Small seconds at 9 h (Calibre 15: at 10 h)
Date bei 6 h
Chrono function with 2 counters: central stop seconds and 30-minutes counter at 3 h
Slide rule

Bracelet:

Cowskin leather strap with tang-type buckle or stainless steel bracelet

Price:

According to condition and model approx. 1.200-2.500 €
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