In the 1920's, EKKO stamps were a staple of the DX hobby.
Radio stations awarded EKKO stamps in exchange for reception reports and DXers collected the stamps in specially designed EKKO albums.
The EKKO Company of Chicago made a tidy profit selling the stamps to the stations and the albums to the DXers.
Business was so good that the PM Bryant Company, also of Chicago, went into competition with EKKO.
Hundreds of broadcasters participated in the stamp programs.
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