The only known surviving example of the Hitachi-made Japanese 7.7mm Type 1 heavy machine gun, serial no. 1, is currently at the US Army Ordnance Training and Heritage Center.
Captured in the Philippines in 1945 (see the June 1945 Intelligence Bulletin on it at Lone Sentry), it was some 52-pounds lighter than the Type/Model 92 (1932) machine gun, although it was not made in quantity.
From the OT&HC:
The Type 1 is gas-operated, air-cooled, and has a removable barrel that is shorter than the Type 92. It is complete with a mount and flash hider. Though this gun is numbered “Serial 1,” this weapon is a production model, not just an experimental item. The number of Type 1s produced has never been verified by any records at the Hitachi weapons factory. This gun is 42.38″ in length and weighs 69.9 lbs.