Is there any knowledge about this sub-machinegun?
The (blurry) picture shows equipment captured by Dutch forces from the TNI in an operation near Magetan in East Java in the beginning of 1949.
The sub shows many features of a MP28-II, but the barrel lacks a shroud and is fluted (if that is the word?).
The Dutch colonial forces made use of the MP28-II before and during the war against Japan and afterwards against the TNI (Indonesian National Army).
Thanks for looking into this.