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1992 quarter no mint mark
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<p>[QUOTE="Conder101, post: 2482987, member: 66"]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. 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. 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'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>
[QUOTE="Conder101, post: 2482987, member: 66"]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. So yes the mintmark in 1992 was part of the master hub and so would be present on all working hubs and working dies. Since the mintmark in the die is incuse it would take a LOT of surface grinding to eliminate the mintmark from the die. That much surface grinding would also eliminate a lot of other shallow detail features on the coin and they are not missing. So mintmark was in the die, it wasn't removed by polishing/grinding, so grease filled die. 1997 with possibly some being done that way in 1996.[/QUOTE]
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1992 quarter no mint mark
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