More eBay photos, this time, a most interesting set showcasing the 20mm oblique cannons of Nakajima J1N1-S "Gekko" night fighters and their installation configuration.
Among the destroyed "Gekko" fighters found by the US Marines, there was an extremely rare, unusual, and intriguing example. All Japanese sources mention that only one or maybe two Nakajima J1N1 Escort Fighter prototypes had an experimental system installed, consisting of TWO remote-controlled turrets with TWO 7.7mm machine guns EACH.
The publication "Moonlight Interceptor" by Robert C. Mikesh and Osamu Tagaya, number #8 in the "Famous Aircraft of the National Air and Space Museum", has more.
The last photo in this eBay set features a badly damaged but fairly intact Nakajima J1N1-S "Gekko" Night Fighter. The tail marking "21-75" is visible and therefore we can conclude that the unit it belonged to was the 321 Kokutai.