I think it's just black. The edges seem to have been dipped in wax or something for most of the bills. In another decade or so when I get to look at this again I'll put them in a book to flatten out.
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The serial number… those are normal blue, red or green…
I had to look it up…
"Some variants of the 1935 dollar bill have brown seals. These Hawaii notes were used after the Pearl Harbour attack. North Africa notes had a yellow seal $1 bills were mostly used in World War II"