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In 1990 I was working for Montana's Fish, Wildlife & Parks agency. There was a high volume of mail coming into the mail room in early April as nonresidents and residents alike submitted their applications for special permits to hunt big game.
One morning a fellow employee brought me an envelope with THIS stamp on it, and asked me if I could tell her what was wrong with it. I immediately spotted the lack of a cancel, and also the lack of any lettering or numbers on the stamp. I told her that yes, I knew what was wrong with it. She allowed me to take the name, address & phone number off of the application, and I went about the task of contacting the person who had put this error stamp on the envelope.
To make a rather long story short, the wife purchased the booklet of stamps and mailed the application for her husband, so when it came time to ask about purchasing the rest of the stamps from the booklet, I had to bargain with her - which I did. I purchased the balance of the booklet for $450, and also threw in one of these covers for her to keep. She accepted my offer.
I created a total of nine of these covers and sent them to Kansas City to get them canceled with the First Day of Issue cancellation. I sold ALL of them. In other words, I have none of them left. I also gave a dozen roses and $50 to the young lady who found the error stamp to begin with, and she thought that was more than the greatest thing she'd ever heard of - paying so much money for simple postage stamps.
And for those of you interested in more mail art, either on envelopes or cards, make sure you visit The Best Hearts Are Crunchy for more 'Eye Candy'!