Stamped with Patent No.1173229 Four fold boxwood ruler made in England. In-laid brass on all hinges with 180 degree protractor - angle finder on center hinge representing true craftsmanship. This rare-find is in the original wrapping, has never been used and would make an excellent addition to your collection. Rulers marked out in inches up to 36" on one side; and millimeters on the other. Condition is New.