error currency collecting

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.

Printed Fold Errors on Federal Reserve Notes: When the Paper Folds During Printing and the Ink Covers the Crease

June 15, 2026 by

Printed fold errors rank among the most visually dramatic and mechanically fascinating mistakes the Bureau of Engraving and Printing has ever released into circulation. This guide breaks down exactly how these errors occur, what varieties collectors should know, and what genuine specimens are worth in today’s market.

Inverted Third Printing Errors on Series 1974 and 1977 Federal Reserve Notes: Upside-Down Seals and Serial Numbers by District

June 15, 2026 by

Inverted third printing errors, where Federal Reserve seals and serial numbers appear completely upside down, rank among the most visually dramatic mistakes ever to escape the Bureau of Engraving and Printing. This deep-dive covers every confirmed district, print run estimate, and current market value for Series 1974 and 1977 survivors.

Missing District Letter Errors on Series 1988 Federal Reserve Notes: Notes That Escaped the BEP Without a Federal Reserve Bank Prefix

June 15, 2026 by

Among the rarest and most dramatic printing errors in modern Federal Reserve Note production, missing district letter errors on Series 1988 notes represent a genuine failure of quality control at the Bureau of Engraving and Printing. This guide explores what caused these errors, how to identify authentic examples, and what collectors should know before spending serious money on one.

Cutting Errors: Offset Cuts, Insufficient Margins, and the Rarest Butterfly Errors on U.S. Currency

June 15, 2026 by

Cutting errors rank among the most visually dramatic mistakes in U.S. currency production, from minor margin shifts to the jaw-dropping butterfly fold that creates a note with two faces. This guide breaks down every major cutting error type, explains how they happen on the BEP’s rotary cutting equipment, and gives collectors the specific knowledge needed to identify, grade, and value these spectacular pieces.