inverted overprint

Inverted Overprint Errors on Silver Certificates: Upside-Down Seals and Serial Numbers on 1935 and 1957 Series Notes

June 15, 2026June 15, 2026 by

Inverted overprint errors on 1935 and 1957 Silver Certificates rank among the most visually dramatic mistakes ever to escape a Bureau of Engraving and Printing press room, with upside-down Treasury seals and serial numbers turning ordinary one-dollar notes into serious collectibles. This guide breaks down exactly how these errors occurred, which varieties command the highest premiums, and what every collector needs to know before buying or selling one.

Grading Error Notes: How Printing Mistakes Interact with Condition Standards at PMG and PCGS

June 15, 2026 by

Error notes occupy a fascinating and sometimes confusing corner of currency collecting, where the rules of standard grading meet an entirely different set of valuation criteria. This guide breaks down exactly how PMG and PCGS Currency evaluate printing mistakes, what qualifies as a gradeable error versus a damaged note, and which specific error types command the highest premiums in today’s market.