Paper fault: visible paper irregularity prior to stamp printing
Paper fold: aka fold, a corner becomes folded over either the front or the back during the stamp's production, but after the printing process and before being perforated.
Paper fault - Clearly visible irregularity in paper introduced at the time of manufacture of the paper (or at least prior to stamp printing).
Errors describe an incorrect type of paper used to print a stamp, typically the use of watermarked paper when it was not specified for the issue. While a paper fault represents a damaged or defective stamp that devalues its worth, ...
 See also: Thin, Handmade, Machin, Mint, Laid paper
  
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