It is on the bottom-right side of the f81v folio, 2 inch from the bottom, 2 inch from the right side. There is not much to see on the regular jpgs, you must use the sids and zoom 100%. There is a group of 3-4 letters. From what I can make: a "reversed question" mark, a "m", a "lambda" and a line. Maybe Landini's colour separation technique will reveal more.
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