<P> Refunding Certificates, issued only in 1879 and only in the $10 denomination, were special in that their interest (4% per annum) did accrue indefinitely, which was meant as a way to persuade people into buying them . However, as very few of these notes were redeemed, in 1907 Congress passed an act stopping the accrual of interest, fixing the value of the notes at $21.30 . </P> <P> The US postal note was a note which could be sent by mail . The sender wrote the amount of money they wanted to send, which could be any amount not exceeding $5, and sent them via mail . The fee for sending the note was face value + 3 cents and the notes required no stamp . They then could be redeemed by the receiver at the Post Office named by the sender . Starting 1887 the notes could be redeemed in coin at any post office . They were discontinued in 1894 . There were five distinct types issued . </P> <P> These notes were issued in 1890 and 1891 and were redeemable in coin . It was the decision of the Secretary of the Treasury whether the coin would be silver or gold . They were originally issued in denominations of $1, $2, $5, $10, $20, $100 and $1,000. $50 and $500 notes were introduced in 1891 . The $1,000 note from 1890 is currently the most expensive note ever, having sold for $3.2 million . </P> <P> After the Federal Reserve system was created in 1914, alongside Federal Reserve Notes, which are liabilities of the Federal Reserve System as a whole, Federal Reserve Bank Notes were issued . They were liabilities of only the Federal Reserve Bank which issued them . In 1929, like other kinds of notes they switched to small size . They were discontinued in 1934 and no longer available from banks since 1945 . </P>

All coins in circulation in the united states are considered to be