http://cgi.ebay.ca/ws/eBayISAPI.dll?Vie ... 0493778494
EKKO stamps were a great marketing idea in the mid-1920s by the EKKO Company, to make verifying reception reports a money maker for radio stations. DX'ers, which made up most of the radio listening population of the time, sent 10 cents in with their reception reports, and got an EKKO stamp in return, by mail from the station. The Depression killed the company, though others bought up the blank stock from the Bankruptcy Receiver and typically used a rubber stamp to add the call letters, instead of the professional printing seen here.
When I DX'ed in the 1960s, EKKO stamps were considered worthless because of the millions in circulation, stored away in attics, inside the fancy albums that EKKO also sold. Since eBay debuted, there has been a pretty good market for EKKO stamps, with a few fetching over $100 each.
