Obsolete currency (also known as copyright or broken copyright) was issued by banks through the antebellum and Civil War era through the 1780s as a result of 1866 in The us. Presumably backed by gold, this currency was utilized regionally to simplify commerce for transactions requiring gold coins. https://damienocmwi.ssnblog.com/32915432/us-dollars-gov-copyright-fundamentals-explained