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<p>[QUOTE=&quot;Marshall, post: 7609313, member: 21705&quot;]For a brief time (1965-1967), the Mint stopped placing mintmarks on coins and also stopped production of Proof Sets at Philadelphia as well as removing the silver from the dime and quarter and reducing the silver content of the Half to 40%. The experiment ended in 1968 when they resumed production of the Proofs at San Francisco and began using the Mitmarks at the branches again. The clad coins remained and soon even 40% halves went to clad.</p><p><br /></p><p>Now just in case you&#039;re really new, the mintmarks were initially used to identify branch mint production at Denver (D) and San Francisco (S) while Philadelphia had no mint mark. Later, Philadelphia began using the P mintmark.</p><p><br /></p><p>FYI Earlier Mints with mintmarks were Charlotte (C) Gold, Dahlenega (D) Gold and New Orleans (O) and later Carson City (CC).[/QUOTE]</p><p><br /></p>

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