There are 4 Grumman HU-16C 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 1954 and 1955.
N70133
1955 Grumman HU-16C
Sparks, NV
N1954Z
1954 Grumman HU-16C
Salem, UT
N116AG
Grumman HU-16C
Mendota Heights, MN
N416C
Grumman HU-16C
Windsor, CA