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<p>[QUOTE=&quot;green18, post: 1723694, member: 10103&quot;]Business strike coins bearing the San Francisco mint mark (in the time frame you mention above) were struck between 1969 and 1974.&nbsp; They were minted in large quantities and generally don&#039;t command much of a premium except for a couple of varieties.</p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p>I think it would be easier to say when the mint stopped making silver proof sets and that was 1964, although the half dollar coins of &#039;68-&#039;70 (proof) did contain 40% silver.&nbsp; In 1992 the mint started making silver proof sets again available to the public.&nbsp; Your &#039;89 half is clad.</p><p><br /></p><p>&nbsp;</p><p><br /></p><p><br /></p><p>All of the mints facilities have at one point or another struck proof coins.&nbsp; The &#039;S&#039; on proof coins didn&#039;t appear until 1968.[/QUOTE]</p><p><br /></p>

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