Funny enough George IIII farthings are very common finds and were hoarded by the public for some reason . They were the first issue of farthings since 1799 1806/7 so there was a bit of a shortage of that denomination in circulation . There were quite a few farthings made between 1821 and 1825 when coinage of pennies and halfpennies resumed , presumably the cartwheels and 1799 issue and 1806/7 issues were sufficient for the public's needs up til then.