There are 5 Waco SRE 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 1941.
N1252W
1941 Waco SRE
Poplar Grove, IL
N58785
1941 Waco SRE
Jackson, LA
N20961
1940 Waco SRE
Mount Pleasant, TX
N20967
Waco SRE
Livermore, CA
N247E
Waco SRE
Poplar Grove, IL