Twin Barrel AA Spider Sight. Japanese T89 Bomber LMG?

Another item ive recently found going through some boxes is this twin barrel spider sight that in nice condition. I have added to Forum i use but with little result except one member who suggested it might well be a sight from a WW2 Japanese T89 LMG as used on bombers. Looking at photos of the T89 then this sight would make sense. My info is just a guess so please purchase as is after your own research! May i add that no detail stamps etc can be found and the length of the top bar measures 7 inches in length.

Code: 63000