Mint vintage HEUER Regatta yachting wrist Timer REF 503.512. 1970's Very good example / rare bird. Minor age / storage marks. Nothing important. 60 sec + 5 min central register. 1 rev per minute. 60-0 reverse countdown scale at dial. Regatta timing system: 5 min color-coded dial system providing instant indication of time remaining before the start. Precision lever movement. 7 jewels. Shock protected. Water-resistant 100 feet (30 meters). All functions working ok. Crown: start - stop - reset to "0". GIANT dial for clear readings. Case diameter (without crown): 52,50 mm Lug to lug (pusher not included): 61,00 mm Band width: 22.00 mm. HEUER signed. Swiss made. Comes with a nice 20 mm NOS NYLON strap (blue). No box or papers included. See pics for detailed description. Vintage watches: Waterproof - accuracy not tested. Service history unknown (if not specified).