Expert: PAPAJACK - 8/6/2007

Question
This half has doubled usoa,half dollar ,part of the Eagle wing and the wooden part of the bell. The "D" is doubled to the south east. Could this be a RPM? The letter doubling appears to be machine doubling.Thank you so much for your time.

Answer
Hello Scotty,                        

RPM is an abbreviation for re punched mint mark. I found no listing for an rpm on the 1960 half.
This does not mean you do not have one just that there is no listing for one.
You can try CONECA at   http://conecaonline.org  The club is the best in identifying new and rediscovered die errors. You can also try email conecawebsite@koinpro.com

If it is machine doubling it has no added value associated with it on any coin. And I often see it still happening with the modern equipment the mint now has.

The edge of each letter is fully doubled as is the “serif” (the point where the letter style juts out slightly at the points of the letters form).

It first may look like machine doubling that is a flat shelf-like shape on the letters but machine doubling would not show doubling on the serif part.

Here is a good web page The National Collectors Association of Die Doubling
describing the difference between hub doubling and machine doubling:
http://www.geocities.com/NCADD/educational1.html

I hope this information Helps.

If there any more information you require on this question just ask.

Thank You and Good Luck

PapaJack