” – Steel Shackle. 2″ high x 3 1/2″ wide. Brass body. Steel shackle. Brass dials. PERMUTATION LOCK CO. DENVER COL.” is stamped on the obverse of the shackle. “PAT’D MAR.28.05 APR.10.06 JAN.1.07” is stamped on the reverse of the shackle.Patent #’s 785834 817388 840088.