There are 4 Sikorsky S-58ET 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 1956 and 1974.
N33602
1974 Sikorsky S-58ET
Riverside, CA
N6BL
1962 Sikorsky S-58ET
Royse City, TX
N1168U
1958 Sikorsky S-58ET
Corona, CA
N58AH
1956 Sikorsky S-58ET
Perris, CA