The origin of Washington quarters can be traced back to 1932 when sculptor John Flanagan's reverse design was first introduced. Initially minted in 90% silver and 10% copper, the composition of the coin changed over time. The reverse design of the coin featured an eagle clutching a bundle of arrows, symbolizing the strength and resilience of the United States. The coin was minted in Philadelphia, Denver, and San Francisco, with mint marks denoting the location of production.