error note values

Double Impression Errors on Federal Reserve Notes: A Complete Collector’s Guide to Notes That Passed Through the Press Twice

June 15, 2026June 15, 2026 by

Double impression errors rank among the most visually dramatic and collectible mistakes in modern U.S. currency production, created when a note passes through the intaglio or offset press a second time and receives a ghostly duplicate image. This guide breaks down how these errors occur, which series and denominations produce the most desirable examples, and what collectors should expect to pay for certified specimens.

Obstruction Errors: When Foreign Objects Cause Missing Print Areas and What These Notes Sell For

June 15, 2026 by

Obstruction errors rank among the most visually dramatic mistakes to ever leave a Bureau of Engraving and Printing press, created when debris, tape, or folded paper blocks ink from reaching the substrate. Understanding what causes these striking anomalies, how to authenticate them, and what the market actually pays separates savvy collectors from those who overpay or miss a bargain.

Inverted Back Errors: How Upside-Down Printing Happens and What These Notes Are Worth

June 15, 2026 by

Inverted back errors rank among the most visually dramatic mistakes in U.S. currency production, created when a sheet of paper passes through the press a second time in the wrong orientation. Understanding exactly how these errors occur, which series produced the most collectible examples, and what they command at auction can mean the difference between recognizing a fortune and passing one by.