There are 7 Piper J3C-75 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 1939 and 1946.
N3320N
1946 Piper J3C-75
Dallas, TX
N58029
1945 Piper J3C-75
Naples, FL
N77545
1945 Piper J3C-75
Buckeye, AZ
N46450
1943 Piper J3C-75
Rossville, TN
N37930
1941 Piper J3C-75
Monroe, WA
N26991
1940 Piper J3C-75
Lake Wales, FL
N6AJ
1939 Piper J3C-75
Charlevoix, MI