Copper

CP SP SM GM
Copper Penny(cp) 1 1/10 1/100 1/1000
Silver Penny(SP) 10 1 1/10 1/100
Silver Mark(sm) 100 10 1 1/10
Gold Mark(gm) 1000 100 10 1

The copper penny is the most common form of wealth, 10 copper pennies is
equal to one silver penny. One hundred copper pennies is equal to one
silver mark, one thousand copper pennies is equal to one gold mark.