Earliest Documented Use (EDU)
By admin on Oct 11, 2007 in Items of Interest
One aspect of United States stamp collecting is earliest documented use (EDU), a branch related to first-day cover collecting. The American Philatelic Society and other stamp experts certify EDUs. They are recorded systematically by the Scott Publishing Company. EDU certification can give a cover a premium value of up to $500 over the price of uncertified covers from the same period.