Helicopter Sikorsky H-19B Chickasaw Serial 55-783 Register 53-4438 used by US Air Force USAF. Built 1954. Aircraft history and location Aircraft History 53-4438 US Air Force 1954-10-06Sikorsky S-55 c/n 55-783, ff:? del USAF as H-19B, 53-4438, 06Oct54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send