Would like to share my recent find. Finally, an IJA Type 90 helmet.
It's a size large helmet with a Shouwa 19 (1944) dated pig skin liner. All three "Zabuton" (cushions) are included.
There is a green streak of paint on the helmet, and I'm not sure what's the real purpose, maybe for camouflage.
There is an interesting triangular symbol, a maker mark?
As for the chinstrap cord, could that be a field made? The black thread seems act as a equalizer, or stopper. (I thought it was a reproduction at first)
The previous owner was 岡田 (Okada).
Here are the photos: