An Ottoman set-square and plumb line, Turkey, 18th Century

The set-square designed with an openwork pattern of interlacing eight-pointed stars, inscribed with a name on the hypotenuse, the plumb-line composed of a triangular mount with hooks and a small weight hanging from a string attached to a hole in the central openwork design of the mount

Both items are in overall good condition, minor surface abrasion along the outer edges of the set square, a thin break on one of the edges of the internal decoration of the plumb-line mount and minor surface oxidation, 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."

inscriptions

Amr' Qatan

Possibly the owner's name