1970 United States Proof Set (large date)

1970 United States Proof Set (large date). This Kennedy half dollar, with a 40% silver content, marked the final usage of silver in American currency. Starting in the 1970s, the United States transitioned away from silver in its coinage. 

A Proof Set comprises a comprehensive assortment of proof coins, encompassing all denominations minted in a given year. These proof coins exhibit strikingly detailed relief with reflective, mirror-like backgrounds and finely frosted, sculpted foregrounds, creating a unique cameo effect. They are cherished as valuable collector's items in their own league.