Kind of a rough concept of the Okean dollar coin. This would be the base unit a coin containing roughly one ounce of silver.

Common rules (Barter)
1 Dollar
1/4 Quarter (Cut dollar piece or quarter coins)
1/8 Bita (Bit) (Cut dollar piece)
1/16 Tip (Cut dollar piece)

Financial Rules (Urban)
1 Dollar
1/2 Half Dollar
1/4 Quarter
1/10 Dia
1/20 Quint (Midsized copper coin with a small silver plug)
1/100 Penny (Small copper coin)