Silver five dolar (yes, that's the correct spelling for the RoC) coin from the "Awanahee" series, 1975-1980. Still in common circulation.
Republic of California Stamps
Owen's Incorperacy Stamps
New England Money
Nickel/silver one dollar New England coin from their recent "silverback" series. In 1890, New England went to rectangular coinage
just to be different from the U.S. and Canada (though they have an "official" explanation of why this is better). Up till 1920, these coins were all silver, but with the 1921 pressing, they went to a nickel/silver sandwich to save money. Half, quarter, and tenth dollars are now all nickel, while pennies are copper/nickel.