The mass of a United States quarter dollar coin produced in 1965, if composed of 90% silver, is a critical attribute. These coins, produced before the switch to a clad composition, possess a defined silver content and thus a predictable physical measurement. This characteristic helps distinguish them from later, non-silver issues that possess a different metallic composition.
The significance stems from the inherent precious metal value contained within these coins. This intrinsic worth makes them attractive to collectors and investors alike. Their historical context, marking a transition in United States coinage, further adds to their appeal and potential financial benefit compared to subsequent issues. Scarcity, determined by the volume of coins that survived circulation, enhances their desirability.