There are 3 Bucker BU-133 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 1946.
N40BJ
1946 Bucker BU-133
Polk City, FL
N1940H
1940 Bucker BU-133
Oklahom City, OK
N317D
1940 Bucker BU-133
San Rafael, CA