BREITLING “NAVITIMER CHRONO-MATIC” Réf 1806 Steel "Pizza" round chronograph watch, black 2-counter dial with painted Arabic numerals and hour markers, date window at 6 o'clock, graduated bidirectional rotating bezel with slide rule. Winding crown to the left. Screw-down case back. Self-winding movement. Steel bracelet, articulated links with adjustable steel folding clasp. Circa 1970 (movement as is, scratches, wear). Diameter: 48 mm.