17. 1860 BALTo”. 5 3/4″ wide (Actual: 4.274″ high x 5.728″ wide). All iron. This is the “Holy Grail” of Wilson Bohannan locks. There are just 3 of these locks known to exist. The lock was made when Gibson and Bohannan were partners in Baltimore. The lock was used on gold wagons to chain a series of chests together. It is a massive lock.Patent # 27883.