Arabic manuscript on paper, 217 leaves, 15 lines to the page, written in naskh script in black ink, numerous geometrical diagrams throughout, a later, probably Qajar, hand in the first maqalah, in brown leather binding

In generally good condition, the margins with some annotations, ownership notes at the beginning and end, some stains and smudges to the ink, as viewed.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

Nasir al-Din Abu Ja’far Muhammad ibn Muhammad al-Tusi (d.1274 AD) was a leading scholar in the field of mathematics, astronomy, geometry and theology. One of his most important contributions to the field of mathematics was his commentary of Euclid's Elements and Ptolomy's Almagest; the earliest copy of this work is dated 656 AH/1258 AD, in the British Library (P. Stocks and C. Baker (ed.), 2001, p.374, M.4). See also Brockelmann, GAL, I. 670 – 676; suppl. I. 924-933.