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Message:: [QUOTE="Ferdyboy, post: 993044, member: 25361"]MD means "mechanical doubling" or strike doubling as it is sometimes called. It is completely different from a true doubled die, usually caused by the coin moving while still under pressure from the strike. A true doubled die is present on the die itself. A doubled die is already present on the die BEFORE the strike, a MD or strike double apprears AFTER the coin is struck.  Chances are, especially with the silver and silver clads that it's MD. There are very few 1964-1970 business strikes that have known doubled dies, but a few of the proofs do. The 1977 D could be a true doubled die, since one is documented for that year/mintmark. See this article to learn to tell the difference: <a href="http://koinpro.tripod.com/Articles/OtherFormsOfDoubling.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://koinpro.tripod.com/Articles/OtherFormsOfDoubling.htm" rel="nofollow">http://koinpro.tripod.com/Articles/OtherFormsOfDoubling.htm</a> The most common doubled die in the series is the 1974-D DDO (doubled die obverse). It shows up very clearly in "WE TRUST". I've found 6 of them in my roll searching. That would be at least 100,000-150,000 coins! There are also DDO's for the 1971 D (never found one) the 1972 P (never found one) the 1984 P (one found) and a DDR (doubled die reverse) for the 1973 D. Hope this helps-----[/QUOTE]