This is a old Japanese Army cap .
It's from war time.for summer cap

This item is made from summer clothing and
 is unused and in extremely good condition.

insignia is a yellow rasa. The chin strap
 and ear fittings are also painted in the 
national colors, and both the front chapter
 and the chin strap are original.

The air holes and drawstring holes are also 
made with eyelet metal fittings and painted 
in the national colors.

The headrest is also made of the same
 fabric and has no lining.

There is no date of manufacture, 
but there is a Matsuyano stamp on the inside
 of the size (approximately 27 cm when folded)
 and on the opposite side.

How about a military collector?