Vintage Glycine Airman SST Automatic Ref. 323.1219 Pilots Watch The watch has been recently serviced (oiled, cleaned and adjusted). All functions work properly.Fantastic Condition  Boeing 733 which was the inspiration for this watch. It was the American version of Concorde, SST stands for Super Sonic Travel. Glycine Airman SST was made for U.S. Air Force pilots (as well as civilian customers) during the 1960s and ’70s.   There are two rings of numbers, both going from one to 24. The Airman SST is both a 24-hour watch and a GMT watch. The first means that it tells time on a 24-hour scale, not a 12-hour scale. The hour hand goes around the two-tone, black-and-grey dial only once per day. The darker half is for the nighttime hours, the light half for when the sun is up. Outside the main dial is a second ring, which can be rotated to track a second time zone, also on a 24-hour scale. The Airman SST needs to be easy to read in dark cockpits, and orange color is one of the easiest colors for the human eye to pick out in poor lighting conditions. Condition; Pre-Owned, Excellent Condition Brand: Glycine Airman SST Movement: Automatic, 17 jewels, excellent.Case: steel, 42mm without crown, excellent condition  Crystal: Acrylic crystal, excellent condition Dial: Black with orange ring, excellent conditionSilicone and genuine leather straps Please see pictures for more details . Watch sold AS IS. International Buyers are responsible for all customs fees