A rare model and the only Slide rule flight calculator made by Heuer since taken over by TAG.
This intricate Chronograph was made in 1991 and features a large steel case with a larger than normal dial surface. The watch uses 3 registers that indicate running seconds, accumulated hours and tenths of seconds elapsed.
The accumulated minutes and seconds are shown with larger green and red hands that circle the outer dial registers and make them more legible.
The rotating outer bezel is a slide rule flight calculator specially designed for pilots. This watch was one of the Professional series of watches designed as tool watches, alongside the 1000M divers watch.
The watch was just serviced and the quartz movement completely serviced and a new battery fitted.
The stainless steel bracelet is sized to fit an 8 inch wrist and comes with a fold out divers extension in the fliplock buckle.
The case measures 43 mm wide by 46.5 mm long. The watch also comes with box and papers, photos of which will be added shortly.