Introduced in 1941, the Ho-103 (also known as the Type One and the Ho-104 when installed in flexible mounts) was Japan's answer to the Browning designed .50 caliber machine guns fielded by their opposite numbers with the U.S. Navy and Marine Corps. Drawing heavily from Browning's design as well, the Ho-103 used the 12.7x81mm Breda cartridge, and traded a lower round velocity for a higher rate of fire. The registered component in the grouping is the top of the receiver bearing the Nagoya Arsenal "fighting fish" logo over the "18.6" Showa date (June 1943) and a Browning-style rear sight marked "NE5-1 C-64231A" (appears to be a U.S. component) welded on. The sideplate is numbered to match the top, with a blued finish.