Pictured is a pewter "Art Bar" from the Franklin Mint circa 1976. Its from a bicentennial set and depicts the Hessian defeat at Trenton. Art Bars were a big deal in the 70's and early 80's, especially those struck in silver. In a numismatic world of round things, something rectangular appealed to many collectors. Typical bars were one ounce silver and depicted every occasion imaginable. They made great gifts at Christmas, birthdays and anniversaries. Private mints like Franklin Mint and Danbury Mint did them in pewter as well, and stretched them out into series where you could purchase the latest one every month. The down side was most of the non-silver ones had no resale value on the secondary market. As for the silver stuff, they quickly became obsolete once the U.S. Mint starting striking Silver Eagles. If you look through issues of The Numismatist from that era, you will see many dealers who sold lots of silver bars. They even had price guides and included stuff like rarity, but most were melted down in 1979-1980 when silver went up to $50. I really don't see any of these any more.