Quarters minted in 1964 in the US include 90% silver and 10% copper. The full silver weight inside a single coin of this sort is roughly 0.18084 troy ounces, or roughly 5.625 grams. This composition distinguishes it from subsequent coinage, which transitioned to a clad metallic development.
The importance of the silver content material stems from its intrinsic worth and historic context. Previous to 1965, circulating U.S. coinage was largely composed of silver. As the value of silver rose within the early Nineteen Sixties, the intrinsic metallic worth of the cash started to strategy, and at instances exceed, their face worth. This spurred a transition to cheaper metals to stop widespread melting of present cash for his or her silver content material.