Have been quite lucky recently and picked some nice bits,the two cases shown here are based on the standard British 3 pounder Naval case,they were used to launch torpedos from the decks of ships. They range in length and are marked with the charge in Ounces on the base. I would like to know the significance of the T on one case and BM on the other please.Any other pics of your cases would be great too. Cheers Tig.