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<p>[QUOTE=&quot;yakpoo, post: 7798680, member: 18157&quot;]Check the Denver quarters in your 1969 and 1971 sets closely. If they have Type-B (proof) reverses, they are quite rare. I&#039;ve never found one, but I keep looking. I&#039;ve read that they&#039;re out there...somewhere.</p><p><br /></p><p>Type &quot;B&quot; (proof) reverses on Philadelphia quarters produced between 1956 and 1964 are somewhat common. Lightly used proof dies were sometimes mistakenly used to produce business strike Philadelphia quarters.</p><p><br /></p><p>Mint marks and proofs were suspended between 1965 through 1967. Beginning in 1968, Washington quarters moved the mint mark from the Reverse to the Obverse and proof coinage moved from Philadelphia to San Francisco. Philadelphia still made all the dies and shipped them to the other Mints for use.</p><p><br /></p><p>Between 1969 and 1972, some proof dies destined for San Francisco were sent to Denver by mistake (reportedly) and used to create a small number of Denver business strikes.</p><p><br /></p><p><br /></p><p>[ATTACH=full]1339032[/ATTACH][/QUOTE]</p><p><br /></p>

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