Inert 47mm casing, used in the Hotchkiss 2 ½ pounder Yamanouchi MK 1 by Japan during WWII. This 47x131mm casing is made of brass. This casing is in good condition. The 2 ½ pounder Yamanouchi MK 1 was a revolver cannon manufactured by the Elswick Ordnance Company and used by Japan during WWII. This cannon was adapted from the QF 3-pounder Hotchkiss produced by Hotchkiss in 1885.