There are 4 Rotorcraft Development OH-58A+ aircraft on the U.S. registry that TailWiki has a page for. Every one is built from the public FAA record — year, serial, engine, home base, and registration history — and owners and pilots add photos, trips, and stories on top. The ones listed here were built between 1971 and 1973.
N200KK
1973 Rotorcraft Development Corp OH-58A+
Lyndon, KS
N115SR
1972 Rotorcraft Development Corp OH-58A+
Wood River, NE
N338SP
1971 Rotorcraft Development Corp OH-58A+
Fountain Hills, AZ
N993YC
1971 Rotorcraft Development Corp OH-58A+
Pawleys Island, SC