A stamp error may be a work of a drunken printer, a broken printing press, paper waste or an innovative creation at the printing house. Perforation errors.
Postage stamp errors occurs by a problem in the printing process.
By a misstake, accident or by purpouse.
Inverted overprint is a classic error but there are a lot more kinds of overprint errors
Inverted overprint is a classic error but there are a lot more kinds of overprint errors
and stamps with perforation errors too
Something can be wrong with he paper making it a stamp paper error.
Or a postage stamps printed on the gum side, just makes it even more interesting. Sometimes it can be hard to get it right even for a stamp printer
