Rule #1 of collecting: Always get the first of something...
Before about the 1940's, stamps simply were put on sale with no ceremony, and customers would buy them at the post office and use them on their mail. Collectors of EKU's are always exploring dealer stocks to find what look like ordinary letters but with telltale postmark dates that indicate usage - ideally - the day the stamp was put on sale. These covers can be worth literally thousands of dollars, and many do go unnoticed in the stock of dealers who don't have any special knowledge about this collecting specialty.
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