There are 4 Monocoupe 90AF 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 1940 and 1945.
N52271
1945 Monocoupe 90AF
Seneca, PA
N18192
1941 Monocoupe 90AF
Stow, MA
N18195
1941 Monocoupe 90AF
Ardmore, OK
N38910
1940 Monocoupe 90AF
Farmington, NM