<p style='text-align: justify;'>Recto: calendrical treatise, dealing with the number of days in the different types of years of the Hebrew calendar and the length of the day in hours and parts (חלקים). Verso: petition to a Fatimid vizier regarding the repayment of a debt. The writer asks for help in dealing with the head of the arsenal, Abū l-Aʿsar, who is claiming the repayment of a debt the writer had never contracted. Dated to the middle of the 12th century.</p>