This small astrolabe comprises three tympanums: two are for latitudes 41°/42°, and 43°/44° (corresponding to the regions between Castille and Provence); the third is ungraduated. There is a rete and an alidade. The rete bears twenty-two silver studs representing the fixed stars. The limb of the mater is divided into 360°. On the connection point coinciding with 115° is a crack that extends along the back. The numbers and words are in Gothic characters. Although undated, the instrument's characteristics suggest it dates from the thirteenth century. Provenance: Medici collections.