RARE NARROW "T. BRADBURN & SONS PATENT BOLTED JOINT RULE" - ARCHITECT

Beveled inside and with a stamp I have never seen on a rule before. "BY HER MAJESTY'S ROYAL LETTERS PATENT".  Bradburn worked in Liverpool from 1839-1870. All 3 pins present. Hinge marked 45° and 90°. A nice rule with all the "it" factors and looks lighter in color than photos show. 3 small extra brass pins were inserted to hold a tight crack near the hinge.