The answer is in the Related Question linked below
No dollar coins were minted in 1930. Check your coin more carefully.
All silver coins minted prior to 1963 are at least 90% silver.
The Great Depression meant that very few coins were needed in commerce. The coins minted were: Cents - all 3 mints Nickels, dimes, quarters - Philadelphia & San Francisco No half dollars, dollars, quarter eagles or half eagles were minted $10 - San Francisco $20 - San Francisco, not released.
The rarest Australian coin minted for general circulation would be the 1930 Penny of which there were only 3,000 minted. It is currently esitmated that there are still about 1,500 of these still being traded in the market.
No US 1 Dollars coins were minted in 1907.
The coins that were minted in France in 1790 were called the livre tournois.
Current circulating U.S. coins are minted in Philadelphia and Denver, with collector proof coins minted in San Francisco.
Standing Liberty quarters were minted from 1916 to 1930, except for 1922 when low demand caused the Mint to suspend production of all low-denomination coins except cents.
There were 1,710,946 1892 British Halfcrown coins minted.
Australian coins minted at the Melbourne Mint do not have a mintmark.
Of the few Australian general circulation coins that were minted in either 1989 or 1990, there were fewer general circulation 1990 coins minted, making them slightly rarer. 1 cent coins - 1989 - 168 million minted 1990 - 52.99 million minted 2 cent coins - 1989 - 124.5 million minted 1990 - none minted for general circulation 5 cent coins - 1989 - 43 million minted 1990 - 31.81 million minted 10 cent coins - 1989 - 43 million minted 1990 - 23.69 million minted 20 cent coins - 1989 - none minted for general circulation 1990 - none minted for general circulation 50 cent coins - 1989 - none minted for general circulation 1990 - none minted for general circulation 1 Dollar coins - 1989 - none minted for general circulation 1990 - none minted for general circulation 2 Dollar coins - 1989 - 30 million minted 1990 - 8.7 million minted
No US dollar coins were minted in 1983.