[Billfish]

But is it realistic ? Maybe they got only a red lamp in the museum under it

also there is a vid around with a blue german revi, because the guy uses a blue lamp

Agree.....As I've seen many other actual Japanese gunsights with the classic yellow (it really a result of the lamp filament) making the sight bright enough more important then color as we're talking 60+ year old electronics. Even light bulbs having progressed dramatically since.

K2