Helicopter Sikorsky HSS-1 / SH-34G Seabat Serial 58-11 Register 137855 used by US Navy USN. Built 1955. Aircraft history and location Aircraft History 137855 US Navy 1955-02-15Sikorsky HSS-1, c/n 58-11, ff? del USN as HSS-1 137855, 15Feb55 xfer NASA Langley, 29Jun56 rtnd USN, asgd VX-1, 18Feb57 w/o NAS Key West, FL, 25Feb59. VX-1 Send Updates Use APP to upload photo @ (optional) When Now? / / Send