There are 4 Hiller OH-23G 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 1962 and 1964.
N2RU
1964 Hiller OH-23G
Mineral Wells, TX
N64881
1963 Hiller OH-23G
Mineral Wells, TX
N62409
1962 Hiller OH-23G
Goff, KS
N99579
Hiller OH-23G
Geyser, MT