Parchment.
Written in Norway in the period 1300-1510. Fol. 1r:1-16 is written skrevet ca. 1350, Fol. 1r:17-25 is written in the fourteenth century and fol. 1v is written c. 1500.
According to Árni Magnússon's notes in AM 683 b 4to it appears that the parchment leaf, containing the Jólaskrá was removed from the back of the legal manuscript, AM 62 4to.