| 1961 50c Proof Doubled Die Rev in 1990 Red Book? I’d like to know if the 1961 Proof Half with doubled die reverse was listed in the 1990 or 1989 Red Book. I know it was listed in the 1991 book. I’m just trying to determine when it started being listed so I can add the data to my post in the Coin Chat section of CoinTalk. http://www.cointalk.com/t71726/ Hopefully, the post in Coin Chat will get some folks interested in error & variety collecting. Any other information & links added to the post are appreciated. Very best regards, Collect89
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