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Why does the RPM get stronger as it gets into later stages? I always thought it would get weaker as the die became more worn over time. Just curious. :)
Most of the time it doesn't. The devices on the mint mark wear down like the other devices. So the RPM usually gets weaker on later die states. (the only case I know of is the 1956-D/S which appears stronger in the later die states) Take a look at coppercoins for the years that have more than one die state and you can see that is so. Even on class 2 doubled dies it is harder to find them on later die states. I have a 1961
DDR that you can't tell by the outside devices that it was a
DDR, but the devices on the EPU still show that it was a doubled die.