Date: 1081/2. Maker: Muḥammad ibn Sa‘īd as-Ṣabbān. Material: Brass. Astrolabe Catalogue Inventory no. 52473. The back contains 7 scales of the following types: Degree; Lunar Mansions; Zodiacal signs; Calendar; Perpetual calendar; Shadow square. The back is inscribed: with a maker's signature marked as مما أحكم صنعته محمد بن سعيد الصبان في مدينة الفرج حرسها الله في سنة تعد الهجرية (Among the objects skilfully made by Muḥammad ibn Saʿīd as-Ṣabbān in Guadalajara (Madīnat al-Faraj) in A.H. 474.).
