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Don't forget Paddy that any silver coin exposed to salt water is going to be corroded, it is completely unavoidable. Then remember that when these coins are recovered they are cleaned to remove encrustation, and not just cleaned with chemicals, they are quite often scrubbed with brushes and then polished with cloths. That is more likely than not why the coin is so smooth.
And as for this - "I understand the minting process first smashing the round bars to flat stock then cutting the flat stock into cob size pieces..." - it never happened. The rough ignots were cut and the coins struck precisely as I described.
There was no smashing of the planchets or the ignots to turn them into flat stock - ever. Not until the advent of the milled coinage series in 1732 did anything even remotely similar happen.
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