FR5 1926 Canal Zone
Operator: Henry Cronkhite
The prefix "cz" was
added as a country identification code for the Panama Canal Zone.
In 1927/1928 the call-sign was changed to nzFR5 (according to the
international intermediate prefix nz for the Canal Zone), and in
1929 to KFR5 (also written as K-FR5).
QSL G4UZN Collection
Info courtesy of Norbert Maibaum