FR-EARB 1928 Canary Islands

It is a short wave listener card, but seems to have been used to confirm a QSO.
The EA4DO history of radio in Spain shows Gebauer as a founder of the Club Radio Canarias, in 1925.
I can find no reference to him ever having received an EAR transmitting call or other later one.
The emphasis by Spanish amateurs at this time was on broadcasting; they were not then highly regulated as they were in most European countries.
The FR-EARB call on the card is imposed over an earlier call - EO 76.

Front side QSL from the estate of G6YL
K8CX Collection
Reverse side QSL & Info courtesy of G4UZN