First unveiled in 1932, the Washington Quarter-Dollar was largely unchanged for 66 years, with the exception of 1933 (no quarters were minted) and 1975 - 1976 (when the reverse of the coin changed to honor the bicentennial of the signing of the Declaration of Independence.)
With 63 years of no change to the design, the Washington Quarter-Dollar is currently the longest lasting design in US Mint history, beating out the Lincoln Wheat Penny and the Lincoln Memorial Penny, both lasting approximately 50 years.
It should be noted that quarters minted between 1932 and 1964 are all 90% silver. They easily fetch $5 in terrible conditions, depending on the price of silver.
