1988P 1c Possible Rpm!!!

[coin-crazy]

I know nothing about rpm's so please understand.To me it look like machine doubling.Thanks for the help..

Mikee

[diamond]

You are correct that this is machine doubling.

[Merlin8971]

This is a very good example of what I would consider a confusing concept. The far left "nipples" of the "D" mintmark look to be completely separate from each other. The lower "nipple," to me, shows the separation more dramatically (the split serif idea).

What specific characteristic about this photo convinces you that it is "machine doubling" rather than a repunched mint mark.

I'm just trying to understand.

[coin-crazy]

I dont understand either because it looks like other Rpm but its just too confusing for me so, I normally just toss them all..

[diamond]

The more elevated portion of the mintmark should show full thickness if this was an RPM. Instead it is abnormally and unevenly thinned. There is a shelf-like separation between the lower portion of the mintmark and the higher portion mintmark. This is all consistent with machine doubling.

[Merlin8971]

One thing I do not understand about machine doubling is how can the machine doubling ONLY affect one device on a coin? I would think that if the die is shifting while forming the devices, that all the devices would be affected (as in a horizontal shift). Of course I guess, if the die shifts in multiple axis directions at the same time one could have inconsistencies. But it is hard for me to grasp that a machine doubling could affect some letters, say, in the motto, but not others. A number of coins (quarters especially) have a normal "I" and a doubled "N", doubled "GOD" and normal WE and doubled R, S, T in TRUST and normal "T & U". The one thing that DOES seem consistent is the direction of the shift, in that all the letters doubled show doubling, say, to the north and east, or on another coin, just to the east.

I also noticed that in the 2001 and 2003 Lincoln penny there is a supposed doubled die that can only be detected by very slight notching of the upper left corner of the "RTY" according to "Strike It Rich..." and others. The notching is so slight I cannot distingish the notching even in the B&W photo in the book.

Another indicator, according to the books, sometimes is extra-thick letters with separation lines. However, if the coin is in Extra Fine condition, the separation line could have already worn away. I would assume at this point that if one cannot detect the separation lines....the coin would NOT be considered doubled?

[diamond]

Isolated machine doubling on, say, just the mintmark, is a bit of a mystery. It's generally thought to affect only the highest-relief design elements, but I think there are other areas as elevated as a mintmark. So I don't really have a good explanation. But there's no doubt about what it is.

As far as subtle doubled dies go, there are some that can only be detected at magnifications above 20x. These may be too minor for CONECA to list, but other attributers list any and all. Being primarily an error guy, I tend to only appreciate the more obvious examples, or ones that are exceptionally wierd.