USPS First Space Achievement and Exploration Hologram Stamps

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You probably won't remember seeing these US Postage stamps. I doubt if very many of them actually made it onto mail. What is interesting about these stamps is that many of them were Hologram images. Also, the pictured press sheet could not be purchased at your local post office. What they offered was the five sheets that this was broken into. But if you bought the post office sheets you will find that you missed out on a large portion of the images. This Press Sheet is ~ 20" X 20"