58. Printing on reverse: Stamps printed on early sheetfed presses are sometimes found with the reversed image of at least part of the stamp on the reverse. This was usually caused by placing a sheet on top of a wet sheet. If done before gumming, the impression of the sheet was transferred to the back of the sheet above. Most are light representations of the design, and value is modest.
Type 58: This copy of Scott 548 has an off-center impression on the back.