There are 5 Dart GK 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 1938 and 1939.
N20924
1939 Dart GK
Hollister, MO
N20994
1938 Dart GK
Norton, OH
N20915
Dart GK
Canton, GA
N20947
Dart GK
Frostproof, FL
N20999
Dart GK
Bethel, PA