Any I.D on this one other lead seals that I have found in the past have the initials of the rail line on them this seal only reads p.o could this be post office
RickRobinson yours appears to be the chicago michigan lakeshore railroad in opperation between 1869-1878 running from New Buffalo to St.Joseph and then later further up the coast it later became the Chicago and West Michigan railroad these pieces are somewhat collectable to the right person so yours is at least 131 years old.They sealed boxcars with wire and a lead seal that they stamped with a pair of pliers with the initials of the railroad company to ensure that the contents of the shipment were not tampered with during transit