Oklahoma Statehood, 50 th Anniversary brass coin, commemorating. This coin features the state capitol building on one side , and the state seal of the State of Oklahoma on the reverse side. Oklahoma became a state, the 46th state in 1907, and this coin was created in 1957. It is in excellent overall condition, showing virtually no wear of anykind, and does have some age darkening to the metal from aging, storage, and handling. Coin is about 1.5 inches diameter with relief style lettering on both sides.