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<p>[QUOTE=&quot;ToughCOINS, post: 2073209, member: 20480&quot;]I lack sufficient knowledge of each facility&#039;s specific capabilities and procedures but, intimately understanding metalworking process and human nature, the following makes the most sense to me:</p><p><br /></p><p>To minimize cost of mint facilities, one would want to do all heat-treatment (both annealing and hardening) at a single location - where the dies were manufactured.</p><p><br /></p><p>To obtain the longest life from dies, one would want to punch the mintmark into the die before hardening.&nbsp; Otherwise, most dies would end up cracking from pre-stress at the mintmark to the rim in far fewer strikes than if punched while annealed, and hardened afterward.</p><p><br /></p><p>If I were the Mint director, I would have all coining dies fully prepared, including punching of mintmarks and subsequent hardening, at the Philadelphia Mint before delivery to the branch mints for production.[/QUOTE]</p><p><br /></p>

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