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<p>[QUOTE=&quot;lkeigwin, post: 1288116, member: 30400&quot;]For much of the 20th century Philadelphia shipped dies to Denver and SF unhardened. The reasoning behind this, according to QDB (A guide Book of Lincoln Cents, p. 53), is they would be unsuitable for use, should the dies land in the wrong hands. Both SF and Denver hardened and finished their dies.</p><p><br /></p><p>Average die life in 1920, at least with regard to Lincolns, was 450,000 strikes. This is almost three times the average in 1909. By 1927 dies often lasted more than a million strikes, due to chrome plating.</p><p><br /></p><p>I am sure I read that Philadelphia often kept the better quality copper and shipped the lesser to the branch mints. Particularly during the awful 1920&#039;s. Since the branches made their own planchets did Philly ship the ingots or copper coils? Or is this just a tale?</p><p>Lance.[/QUOTE]</p><p><br /></p>

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