5RX 1921 Haileyville, Oklahoma

The operator was Carl Fred Moltzen, 5RX (1920's Oklahoma), W5UIF, ex-W5UL (c. 1930 Oklahoma), W5DHI (c. 1936 (Oklahoma), W9GIX (1940-1970s Chicago).
He was born July 23, 1906 in Haileyville, Oklahoma and became a Silent Key May 1985 in Hartshorne, Oklahoma.

QSL from the estate of W5KC
QSL, Info courtesy of W5KNE