United States quarters, historically composed of 90% silver and 10% copper, underwent a compositional change. This alteration involved replacing the silver content with a clad composition, primarily copper-nickel. The inquiry centers on pinpointing the specific time this transition occurred.
The switch from silver to a base metal composition was primarily driven by economic factors. Rising silver prices made it increasingly expensive to produce quarters with a high silver content. Continuing production with the original composition would have resulted in the intrinsic value of the silver exceeding the quarter’s face value, creating the potential for widespread melting and hoarding. This change preserved the coin’s intended function in circulation.