“D. K. MILLER LOCK CO. PHILA. PAT. JULY 26.70 OCT.21.73″ – Horseshoe High Shackle. 3 1/2″ high x 2 1/2” diameter. “D. K. MILLER LOCK CO. PHILA. PAT. JULY 26.70 OCT.21.73” is stamped on the left edge of the body. The obverse and reverse of the case is plain.Patent #’s 105710 143831. (7-60).