Helicopter Sikorsky H-19D Chickasaw Serial 55-685 Register 52-7625 used by US Army Aviation Army. Built 1954. Aircraft history and location Aircraft History 52-7625 US Army Aviation 1954-04-07Sikorsky S-55 c/n 55-685, ff:? del US Army as H-19D, 52-7625, 07Apr54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send