HEUER (CHRONOGRAPHE CALCULATOR - CHRONOMATIC / BLUE / Ref. 110.633 M), vers 1974

Imposing pilot chronograph in solid steel with screwed back (signed Heuer Leonidas).

Large metal bezel with bi-directional oversized slide rule for measuring intermediate times or fuel consumption (patinated with marks). Blue dial with two ringed counters (at 3 o'clock : 30 minutes with orange marking and at 9 o'clock graduation on 12 hours, date window at 6 o'clock, applied indexes and luminescent hands for better vision during the race.

One vintage pilot strap in oiled leather with Heuer buckle and one vintage Tropic strap in rubber.

Movement: mechanical automatic winding caliber signed LEONIDAS HEUER / Buren 12 Swiss.