Help with Photo / Uniform?

[Ser-g]

ya in Holland we have gymnasium's too ,, its the highest middle school.
it includes classic languages like Greek and Latin.

at witch time frame can we put this foto ?
at first i Thoth just prior to ww2 or after.

but yesterday my eye fell on the double piping, witch suggest imperial.

and thoughts on that mather ?

kind regards ser-g