OMM would be a D over S. A RPM is a S/S. but as John1 mentioned, this is Machine Doubling. Note the outside of the device is affected. The contour is removed. The affected are is flat shelf like. Just MD as mentioned.

Note on these examples, the mintmark is enlarged, showing spread. If there were just enlargement, it does count. It has to show spread between the punching of the mintmark punches.

Note on these examples, the mintmark is enlarged, showing spread. If there were just enlargement, it does count. It has to show spread between the punching of the mintmark punches.
Richard S. Cooper
Some have asked about my images I use and I'm glad to say, you can now you can see the DVD in sections on youtube:
1. Intro, older coins, toned coins 2. Doubled dies 3. Die events, One of a kind errors 4. So called errors, Coin information 5. Coin information Types and Varieties, Overlays
Jefferson nickel doubled dies Wexler/Rebar complete listings
trail dies:http://www.traildies.com/
Some have asked about my images I use and I'm glad to say, you can now you can see the DVD in sections on youtube:
1. Intro, older coins, toned coins 2. Doubled dies 3. Die events, One of a kind errors 4. So called errors, Coin information 5. Coin information Types and Varieties, Overlays
Jefferson nickel doubled dies Wexler/Rebar complete listings
trail dies:http://www.traildies.com/
Edited by coop
11/26/2020 12:50 pm
11/26/2020 12:50 pm