Helicopter Sikorsky S-55 Serial 55-1015 Register N883 used by CONOCO (Continental Oil Company). Built 1956. Aircraft history and location Aircraft History N883 CONOCO 1956-10-06Sikorsky S-55 c/n 55-1015, ff:? del CONOCO as N883, 06Oct56 Send Updates Use APP to upload photo @ (optional) When Now? / / Send