thats quite a good way of doing it the reason i have all these farthings is because i bought a load of them for £10 off of ebay they are worth atleast £50 though, with a lusterous 1806 farthing
and there cannot be 5 half crowns in a sovereign because: a half crown is (according to your table) 30 pennies...and 30 pennies x 5 = 150 pennies, not 240 pennies... you should see a psychiatrist!