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you drive a hard bargain...
turns out I got the centuries mixed up... it doesn't "break" strict metallic backing until the 1780s, so technically Greeley is correct for the 17th century (and most of the 18th).
(And I had to scurry through my note archives and library since I didn't have this neatly collected in one place...)
Only meaningfully breaks in the 1780s:
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Less cheating than I expected
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Obviously, I want to see the nerdy backing chart