“MILLER’S 6-LEVER” – No Pins – Low Rounded Shackle
It is not clear if this is a factory low rounded shackle, or altered after manufacture. “D. K. MILLER LOCK CO. PAT. JULY 26.70 OCT.21.73 PHILA PA.” is stamped on the left edge of the body.Patent #’s 105710 143831. (M840).