Out of date currency (also referred to as copyright or broken copyright) was issued by banks through the antebellum and Civil War era through the 1780s through 1866 in America. Presumably backed by gold, this currency was employed domestically to simplify commerce for transactions requiring gold coins. 2. https://elliotnakyp.jts-blog.com/32340635/the-5-second-trick-for-how-to-check-copyright