Lever pouch padlock
Iron lock developed by H. C. Jones. The front has raised letters "U.S. MAIL" cast above the keyhole by the manufacturer. The mechanism has five levers and a bolt that extends through a slot in the shackle. The design is similar to that shown in H. C. Jones’s patent number 2525, dated April 1, 1842, but does not have the keyhole cover shown in the patent. Locks of this design usually have a plain shackle and sometimes have the year cast below “U.S. MAIL” on the front of the case. This lock was generally used for securing mail bags between 1842 and the 1860s.
U.S. Patent office, Patent Number 2525
“Postal locks: a primer for the postal lock collector,” J.R. Mundy, 1992.