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<p>[QUOTE=&quot;physics-fan3.14, post: 3316171, member: 19165&quot;]What it says is that this was the final piece of the design punched into the die. It is much easier to punch a mintmark into soft steel. However, you need hard steel to strike the coins with. So, after all of the design elements were engraved in the die, it was hardened in order to strike the coins. </p><p><br /></p><p>You can read about the entire process in Roger Burdette&#039;s book, &quot;From Mine to Mint.&quot;[/QUOTE]</p><p><br /></p>

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