Helicopter Sikorsky H-19B Chickasaw Serial 55-762 Register 53-4423 used by US Air Force USAF. Built 1954. Aircraft history and location Aircraft History 53-4423 US Air Force 1954-10-13Sikorsky S-55 c/n 55-762, ff:? del USAF as H-19B, 53-4423, 13Oct54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send