“D. K. MILLER LOCK CO PHILA. PA PATD JULY 26.70.” – No Pins – “U. S. INT. REV.”. “U. S. INT. REV.” is stamped on the obverse of the shackle. “D. K. MILLER LOCK CO PHILA. PA PATD JULY 26.70.” is stamped on the obverse of the body. The reverse and the left edge of the case is plain.Patent #’s 105710.