The 90% Barber Quarters were a series of United States quarter dollars minted from 1892 to 1916. These coins were designed by Charles E. Barber, the Chief Engraver of the United States Mint at the time. They were composed of 90% silver and 10% copper, giving them a distinctive silver-gray color. The obverse featured a bust of Liberty wearing a laurel wreath, while the reverse depicted an eagle with outstretched wings. These quarters were widely circulated during their production period and are now highly sought after by coin collectors due to their historical significance and silver content.