Helicopter Sikorsky HO4S-3 Serial 55-729 Register 1308 used by US Coast Guard USCG. Built 1954. Aircraft history and location Aircraft History For 1308 see also tth 1308 407gxp 54589 1308 US Coast Guard 1954-07-02Sikorsky S-55 c/n 55-729, ff:? del USCG as HO4S-3, 1308, 02Jul54 wfu & sold Keystone Helicopters, 18Mar68. Send Updates Use APP to upload photo @ (optional) When Now? / / Send