Heuer, Switzerland for Beechcraft, United States. 3500 Calculator automatic chronograph watch, ca. 1970s. Stainless steel case and bracelet. Dark blue dial with two subsidiary dials and a date window. The watch is powered by a caliber 12, 17 jewel automatic movement.

Case; diameter: 47 mm.
Band; width: 20 mm.
Lug; width: 9 mm.
Gross weight: 136 g.