BRETLING "Navitimer Chrono-Matic, Ref. 1806". Steel pilot's wristwatch with chronograph and slide rule, polished steel tonneau case, screw-down caseback, matt black crenellated rotating bezel with inner ring graduation, slide rule, pump pushers and crown on the left, black lacquered dial, silver writing, two silvered counters, tritium hour-markers and hands, date window at 6 o'clock, leather strap with steel pin buckle, signed (wear to caseback, counters stained). Self-winding mechanical movement, cal 12. Circa 1970. Dial, case and movement signed. Case diameter: 49 mm Length: 18.2 to 21.4 cm Expert: for this lot, SC E S PORTIER is assisted by Géraldine Richard, SFEP expert. All watches were function-tested at the time of writing. Except for the mention of a mechanism "to be overhauled", the watches were functional. However, the accuracy of the movements is not guaranteed, nor is the functioning of the watches beyond the time of sale.