Type 98 20 mm AA half-track vehicle

The Type 98 20 mm AA half-track vehicle was an experimental Japanese self-propelled anti-aircraft gun. It had a single 20 mm Type 98 AA machine cannon mounted on the back section of a Type 98 Ko-Hi half-tracked prime mover.

Source: Wikipedia — Type 98 20 mm AA half-track vehicle (CC BY-SA 4.0)