This helicopter was modified by Orlando Helicopters, which were notorious for swapping data plates to suit their needs. When inspected in 1992, it carried the fake dataplate of HRS-1 127834 (c/n 55072), the serial that has been applied by the museum. But later inspection showed it also carries Orlando Helicopters modification plates confirming that the airframe is actually ex 138508 (HO4S-3, c/n 55555). It once flew as N95763, during which time it was - rather confusingly - fitted with yet another fake dataplate, this time claiming to be UH-19D 57-1619, c/n 551173. In short, this helicopter is conclusively identified as HO4S-3 c/n 55555, ex 138508, N95763. Thanks to Andy Marden for the info.