Date:
1958
Variety:
RPM
Mint:
Denver
Coneca:
9
Coppercoins:
9
Based on the die scrapes, I'm thinking stage A.
Added pic of what I believe is MDD for the year as another marker.
VV CC
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Your assessment seems pretty good. In addition, you are correct in that the doubling on the 8 of the date is the result of master die doubling. Good find.