From my last FR campaign:
Imperial- platinum pc (pp)
Royal, sovereign or pound- gold pc (gp, gs or lb)
Ducal, Duke or shilling- silver pc (sp or ss)
Count, pence or penny- copper pc (cp or p)
Baron, 1/10 pence, tenth or wedge- copper bit (cb)
1pp = 10gp = 100sp = 1000cp = 10000cb
1gp = 1/10pp = 1gp = 10sp = 100cp = 1000cb
1sp = 1/100pp = 1/10gp = 1sp = 10cp = 100cb
1cp = 1/1000pp = 1/100gp = 1/10sp = 1cp = 10cb
1cb = 1/10000pp = 1/1000gp = 1/100sp = 1/10cp = 1cb
pp = 1oz each (8/lb), gp = 1oz each (16/lb), sp = 1/2oz each
(32/lb), cp = 1/4oz each (64/lb), cb = 1/40oz each (640/lb)
One pound Au = 1pp 6gp, 16gp, 160sp, 1600cp, 16000cb
Mithril pc (Dwarven): 10/lb, 1.6oz each = 3sp 5cp
Electrum pc (Elven): 28/lb, 0.6oz each = 5sp = 1/2gp
Orichulm pc (Divine): 4/lb, 4oz each = 1000gp or 10000sp
This is my 3rd revision of my FR house monetary system. Hopefully I've
got it right this time ;->. The system is basicly metric in nature. The
copper bits are actually a copper piece divided into 10 wedges, a literal
"bit". The mithril and electrum coins are cultural monetary units rarely
seen outside there respective societies. The orichulm coin is a magical
metal of divine nature. Very few of these coins exist, four are in my entire
FR campaign. These coins possess one unique quality (besides rarity), they
absorb magical energy like water to a sponge. Each coin absorbs this energy
in a further unique manner, each acquires unique magical abilities. These coins
can be used as magic items in there own rights or the metal can be forged
into other magic items. The created item acquires the coins powers besides
becoming extremely easy to further empower.