Astrolabe: Eastern

Body, rete, uninscribed diopter with sights, pin, washer, horse, handle, ring and 4 original tympans. Fifth tympan from another instrument. Roman months. 26 star markers. Labeled in Arabic. "sana`a hadha al-asturlab muhammad ibn yusuf ibn hatim `afa allah tammahu sanah kh.l." [Muhammad ibn Yusuf ibn Hatim--may God forgive him--made this astrolabe]