Antique Folding Sector Architect Drawing Drafting Ruler \"Bone\" For Sale

This antique 12 inch folding naval sector rule is clean and functionable without any stains.It has no warping and the locating pins fit snuggly. The ends meet when closed.There are a couple of tiny cracks at the rivets by hinge, a common fault and of no consequence.This rule was most probably made in the late 1800\'s to very early 1900\'s. The overall condition of the White rule and the Brass hinge, is Very Good with only a sight shading of the White material. I see only one very minor, short tight stress crack at the hinges pins (very typical of sector rules). All of the graduations and numbers are strong and dark. The hinge works as it should. Both of the alignment pins are present. Tiny, tiny gap where the ends meet. Not a big issue. No owners marks. Please let the pics show condition.