Helicopter Sikorsky H-19B Chickasaw Serial 55-784 Register 53-4879 used by US Air Force USAF. Built 1954. Aircraft history and location Aircraft History 53-4879 US Air Force 1954-11-10Sikorsky S-55 c/n 55-784, ff:? del USAF as H-19B, 53-4879, 10Nov54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send