This is another note found. I have looked this up and found contrasting values? Thank you all for your welcoming words :)I have started to do some research on the coins in the Whitman books and I am trying to get them uploaded.
The serial number here is 35901, so the letter 'M' over a number '1' is known as a fractional (letter-number) prefix. If it came after the serial number it would be a suffix. If you look at any of your dollar bills you'll see that they have a one or two-letter prefix before the serial # and a one-letter or '*' suffix after.
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