On the edges, it's supposed to have stamped "FIFTY CENTS OR HALF A DOLLAR", but instead, the word "HALF" is mispelled. The "OR HALF" is overlaid on each other and it is missing the letter "H". Does this increase the value more than what the book gives? I'm sure Collectors look for this kind of thing. I'll post a picture of the edge of coin if someone wants to see what I'm talking about. Any thoughts?