There are 3 Minicab GY-20 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 1964 and 1968.
N4271
1968 Minicab GY-20
Rockton, IL
N6824D
1964 Minicab GY-20
Edson, KS
N8166
Minicab GY-20
Williamsburg, VA