LIEUTENANT COLONEL DAVID MASON’S GUNNER’S PERPENDICULAR AND CASE, C. 1776 A gunner’s perpendicular, probably produced in Massachusetts. : LIEUTENANT COLONEL DAVID MASON'S GUNNER'S PERPENDICULAR AND CASE, C. 1776 A gunner's perpendicular, potentially produced in Massachusetts, courting on the 2nd 50 percent in the 18th century, engraved around the reduce portion https://jaidenzvjqk.blogmazing.com/25783859/not-known-details-about-masonic-ring