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Raised, inverted edge lettering explanation?

In this thread, RVDavis presented the first of what I assume is many presidollars with inverted, raised lettering on the edge. I proposed that they could be made by coins coming into contact with each other in a bag, but this would have produced much more random results. What about a traffic jam of sorts within the edge lettering machine, causing the coins to slam into each other before exiting while still aligned properly? Has anyone studied how the edge lettering machine works well enough to consider whether this is plausible?
John
Keeper of the VAM Catalog • Professional Coin Imaging • Prime Number Set • World Coins in Early America • British Trade Dollars • Variety Attribution
Keeper of the VAM Catalog • Professional Coin Imaging • Prime Number Set • World Coins in Early America • British Trade Dollars • Variety Attribution
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<< <i>In this thread, RVDavis presented the first of what I assume is many presidollars with inverted, raised lettering on the edge. I proposed that they could be made by coins coming into contact with each other in a bag, but this would have produced much more random results. What about a traffic jam of sorts within the edge lettering machine, causing the coins to slam into each other before exiting while still aligned properly? Has anyone studied how the edge lettering machine works well enough to consider whether this is plausible? >>
That is a good theory, since it could explain how the coins were on the same plane when they collided, but I do not know anybody that has seen the machine in operation.
TD