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<p>[QUOTE=&quot;Conder101, post: 1150630, member: 66&quot;]Not worth the trouble to punch a mintmark into a hardened previously used die.&nbsp; You can&#039;t punch it into the hardened die, so you have to anneal the die to soften it.&nbsp; Then punch in the mintmark.&nbsp; Then reharden the die, clean and repolish it.&nbsp; Then etch the surface to give back the frosted surfaces.&nbsp; Then hope that the stresses from hardening, softening, working and rehardening don&#039;t result in internal stresses that may cause premature failure.</p><p><br /></p><p>You say it has been done numerous times.&nbsp; Not with US coins.&nbsp; There are only two or three times when used dies been reworked and then reused (1806/5).&nbsp; In each case the die quickly failed after reworking.&nbsp; Now if you are thinking about the various overmintmarked dies or other overdated dies those dies had not been previously used or hardened.&nbsp; And when you have a die shop continuously hubbing new dies, why bother reworking an old one?[/QUOTE]</p><p><br /></p>

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