PCGS has certified the third-known.two-tailed-Washington quarter dollar as Mint State 62.

The Washington quarter dollar struck with two reverse dies reported by an error coin dealer has been authenticated and graded by Professional Coin Grading Service. The grading service has alsocertified a Proof 1968-S Washington quarter struck in 90 percent silver instead of the intended copper-nickel clad composition.

Both U.S. coin errors struck at the San Francisco Mint in the 1960s were submitted to the grading service by error coin dealer Fred Weinberg of Fred Weinberg & Co. in Encino, Calif. The coins camefrom different sources.

The two-tailed Washington quarter dollar is only the third known such error struck with two Eagle reverse dies. Weinberg purchased the coin from a collector during the Sept. 7 to 9 Long Beach Expoin Long Beach, California.

The coin is struck with normal die alignment on the intended copper-nickel clad planchet composed of outer layers of 75 percent copper and 25 percent nickel bonded to a core of pure copper.

The coin's weight is 5.6 grams, slightly lighter than the 5.67-gram standard.

Production of the two-tailed Washington quarter dollar is believed to have been executed at the San Francisco Mint between 1965 and 1967.

To read the complete article, see:
PCGS certifies two-tailed quarter, plus a 1968-S quarter on 90 percent silverplanchet (http://www.coinworld.com/news/us-coins/2017/09/pcgs-certifies-two-tailed-washington-quarter-dollar.html)