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<p>[QUOTE=&quot;Conder101, post: 2482987, member: 66&quot;]The mintmarks on the proof coins became part of the Master hub in 1985, and on all the business strike coins from P and D (except the P cent) in 1990.&nbsp; So yes the mintmark in 1992 was part of the master hub and so would be present on all working hubs and working dies.</p><p><br /></p><p>Since the mintmark in the die is incuse it would take a LOT of surface grinding to eliminate the mintmark from the die.&nbsp; That much surface grinding would also eliminate a lot of other shallow detail features on the coin and they are not missing.</p><p><br /></p><p>So mintmark was in the die, it wasn&#039;t removed by polishing/grinding, so grease filled die.</p><p><br /></p><p><br /></p><p>1997 with possibly some being done that way in 1996.[/QUOTE]</p><p><br /></p>

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