2 other possibilities : byakudan-nuri is used so covered with lacquer (therefore reddish): on the kuzasuri plate the urushi layer being partially flaked the previous owner preferred to remove the entire upper one to make it cleaner therefore revealing the gold layer. or the entire top layer is simply completely gone naturally...
I think no interest translation and /or in the papers here. Just a reinforcement to stand well the plates of the sode.we can see often with hemp,cloth or leather ..often when the odoshi is litle tired or to prevent it..
Just my opinion
As everybody said all materials is quiet new here showa or newer considering the laquer inside and outside the menpo , and the laquer and lacing of the tare... a complete example ..
A very good kabuto congratulation 👌
.
I ve got one zaboshi kabuto late momoyama /.early edo from the Haruta school . This is a signed kabuto : Haruta no Katsuyoshi
Few same sellers every years at auction sold set in this puzzle way . So certainly the sellers cutting the historic samurai sets for money are known by others sellers ...afraid to say no one can do anything ...
Terrible situation again, for a nice historic set ! sometimes i think few sellers use a 2nd or 3rd count for a quick sell ....money .....like a ghost seller....
A nice jingasa Cerjak as said .. you can find many different shapes number of plates in construction and different materials used (iron , leather ...) to build
and different use ...