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<p>[QUOTE=&quot;clcrx7, post: 1848512, member: 66258&quot;]So I&#039;m new and it was this very thread that I found doing a search on this very topic that made me decide to create an account and post...</p><p><br /></p><p>So I have also found a 1978 no mint mark dime...looking at sch&#039;s and the one I have, they both have the 2 deep grooves on the left side of the flame on the reverse...now, if I understand correctly, this is a proof mint feature and only the San Francisco Mint produced these at that time (1965 - present).</p><p><br /></p><p>I also have 2 1977 D mint mark dimes, a 1978 D mint mark dime and a 1979 D mint mark dime, all with the 2 deep grooves...</p><p>&nbsp;</p><p>I don&#039;t see these same groove markings on slightly newer mintages on...</p><p><br /></p><p>So, and this is where I need some help...either:</p><p>&nbsp;</p><p>1.) This was a typical die feature during the 70&#039;s for all mints or;</p><p>2.) the Philadelphia and Denver mints were using proof reverses that only San Fran was supposed to be using or;</p><p>3.) the 1978 no mint mark dime was actually minted in San Fran and is missing the mint mark (not likely and doesn&#039;t explain the 77-78 D mint mark version).</p><p><br /></p><p>Any ideas?&nbsp; My guess is I thought way too hard about this.[/QUOTE]</p><p><br /></p>

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