OCT.15.72 ” ” 28.73″ – Steel. 3 7/8″ high x 3″ wide x 1/2″ deep. Steel body. Steel shackle. Brass dials. There are 19 positions on each dial including neutral. The combination is changeable. US Patent #144114. US Patent #148471. More… There is only 1 of these locks known to exist.