This is in Peter Furst's collection.

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If the number at the top is a date then it is 1341. It is difficult to read as it seems to, our modern eyes, to be a mix of Italian and Spanish. The writer's name is Bobo (or Bobus).

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We would love to know what it says, so if  you fancy trying to translate it, even if only a small part, do let us know the outcome.