Japanese WWII artillery rounds

These are a pair, both have “Alexander T. Kardos S.W.P.A.1943-1944” etched on them, SWPA= South West Pacific Area, an Allied command during World War II. Which calibre are they? The base rim is about 91mm. The scary green background behind the cartridges is called “grass”, it is usually not dangerous to humans, and the javelina looking animal we call a “dog”, as friendly as grass. So, to my friends in AZ, it is normal here in the East.

Nice trench art. Probably cut down 75mm (7cm) cases, of which the Japanese had several different types.

You forgot to mention the red, white, blue and black “rocket” in the background:-)