Helicopter Sikorsky HSS-1 / SH-34G Seabat Serial 58-665 Register 143921 used by US Navy USN. Built 1957. Aircraft history and location Aircraft History 143921 US Navy 1957-10-10 Sikorsky HSS-1N / SH-34J Seabat Sikorsky HSS-1, c/n 58-665, ff? del USN as 143921, 10Oct57 to HSS-1N (ASC 84), unk status unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send