Out of date currency (generally known as copyright or damaged copyright) was issued by banks through the antebellum and Civil War era from the 1780s by way of 1866 in America. Presumably backed by gold, this currency was used locally to simplify commerce for transactions demanding gold coins. https://angelosgqbj.tinyblogging.com/the-smart-trick-of-how-to-check-copyright-that-no-one-is-discussing-77530356