THE STAMP COLLECTING PROCESS
“The process was very simple. For only $1.75, the EKKO Company offered an album to the collector of new stamps. The album contains pages preprinted with an outline of each of the stamps currently available, a listing of broadcast station call letters and wavelengths, and a nice map on the inside cover showing the locations of these stations.
Spaces were also left for stations not yet participating, or stations that were just coming on the air. In addition, there was space to jot down up to four dial settings at your own time of reception.
"Proof of Reception" cards were furnished with the album.
Listeners needed only to send a few facts on these cards about when and where on the dial they had heard a broadcast, plus ten cents to cover mailing costs, to the station. There the card was checked against the station log for accuracy, and the listener was mailed a stamp with the station's call letters and design upon it.
An ad for this stamp album appeared in Radio News, April, 1925.
Interest in the hobby became so widespread that the February 1925 issue of Radio News featured the Ekko stamps on its cover.”