Press sheet

A press sheet is essentially a full printed sheet of stamps as it comes off the printing press. They are kept by printers as a reference, sometimes having notes added for colors used, changes that need to be made, etc. As such, they are usually imperf.

However, this practical concept has been been turned into a philatelic money-making device when full printed sheets are sold to collectors. The USPS sells press sheets, often imperf and in the case of self-adhesives, die-cut or imperf. That alone should give an idea that what you are getting is not a genuine artifact of the printing process. The storage and display problem alone should discourage collecting these, but collectors will be collectors. 



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