There are 6 Piper J3C-90 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 1941 and 1946.
N6317H
1946 Piper J3C-90
Garden Plain, KS
N98040
1946 Piper J3C-90
Kirkland, IL
N98863
1946 Piper J3C-90
Jamul, CA
N35536
1941 Piper J3C-90
Pueblo, CO
N35124
Piper J3C-90
Sterling, AK
N70675
Piper J3C-90
Ranier, MN