“B EBERT & SONS PAT OCT 8 1867”
3 7/8″ long x 3 3/8″ high x 1 1/2″ cylinder diameter. Iron body. Iron shackle. This is triple chamber lock. The key enters, turns 90 degrees, drops into second chamber, turns 90 degrees, drops into 3rd chamber, engages a ward in the turn-table and the lock opens.Patent #69645.