This looks like a new rpm....

[coin-crazy]

Im not sure about this and maybe I shouldnt be posting here but oh well.Im not good at rpm's and I hardly look at mint marks.So what you think? I checked coppercoins and was unable to find any thing like it.. Thank you all for viewing and more so for your feed back.. (Mikee)

[RWBILLER]

looks llike machine doubling - maybe frank will step in.
roger

[coin-crazy]

Im not sure but I dout that. The mint mark had to be added for these years.Its not till later on that the mint started using the single squeeze plating!!

[RWBILLER]

MD machine doubling occurs after the mint mark was added - during the striking process. if your anaylisis was correct - machine doubling would only occur from 1990 on and we have seen MD on many years before that. i'm not saying it isnot a rpm - just my first blush look.
thanks
roger

[coin-crazy]

Not to take this the wrong way but if that was the case then there wouldnt be no such thing as a rpm.It would all be considered M.D.If this was the result from the single squeeze then yes it would be machine doubling!!!Im going to have to stick to my guns on this one,unless one of the experts say other wise.

[RWBILLER]

i guess your right - i guess you can have md on the date/liberty/face, etc. but not on the mintmark.
i would send it in and get it listed.
roger

[jcuve]

An RPM is a product of a Mintmark punch being hammered into the die face in slightly different direction at least once from a previous punch. What you have is MD, a striking error, which to a degree looks similar but is entirely different.

[Roller]

Not to take this the wrong way but if that was the case then there wouldnt be no such thing as a rpm.It would all be considered M.D.If this was the result from the single squeeze then yes it would be machine doubling!!!Im going to have to stick to my guns on this one,unless one of the experts say other wise.

The process is easily misunderstood unless you know how the MM was applied. Pre '89? the MM was punched into the finished working die by hand. Sometimes it took more than one tap on the MM die to get sufficient resolution; sometimes the first attempt was in the wrong spot etc. The second/third tap on the MM die in some cases would be slightly off the mark, thus creating a second image of the MM. Form your response it appers that you think the second strike to the MM occurs durong the striking of the coin. If it were so, than you woulld be correct that all RPM's are MD's. But, alas, it is not so.

[RWBILLER]

jason/roller:
thankyou
roger

[coin-crazy]

Here comes Jason to crash the party..Lol.Well if it was added how could this be M.D? I just dnt understand as far as logic goes with the whole process..Im going to leave it alone and move on..Thank you guys and Roger ,you was right Im wrong..

[jcuve]

MD is a weird striking error where, after the coin is struck, the die hits or slides into part of the previously struck coin ever so slightly. It will often flatten, partially or completely, struck devices. It can be strangely isolated, or over large portions of the coin.

I have a large visual tutorial on MD (Machine Doubling) here: http://errorvariety.com/OFD/MD.html

[jcuve]

BTW nice quick explanation of RPMs Roller!

[RWBILLER]

coin-crazy
i think that was the first time i was right with anything as far as coins go.
your a great sport! and thankyou - i appreciate that very much.
roger

[Roller]

BTW nice quick explanation of RPMs Roller!

Thanks Jason. Tat's a valued compliment considering the source.

[copperlover]

Thanks for this tutorial Jason. Much appreciated.

Lucien