Helicopter Sikorsky H-19B Chickasaw Serial 55-812 Register 53-4450 used by US Air Force USAF. Built 1954. Aircraft history and location Aircraft History 53-4450 US Air Force 1954-12-07Sikorsky S-55 c/n 55-812, ff:? del USAF as H-19B, 53-4450, 07Dec54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send