From the Hamilton Mint series – “Wonders of America”. Produced by The Hamilton Mint. 999 fine silver art bar. Approximate weight 31.7 g. Measures: approximately 2 inches by 1 inch. Quite often silver art bars commemorate historical events, locations and holidays here in America and around the world. Silver is a “HOT” commodity right now. 1973 appears to be a very popular year for silver art bars. There are a lot of small private mints that minted silver art bars that have a 1973 mint date. Some of those private mints were USSC (United State Silver Corporation), Mother-Lode Mint, Madison Mint, Hamilton Mint, and Colonial Mint to name a few of the private mints that produced these.