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I did a little reserch on these plate that are screewed into the stock. One of the charactors on the plaque has a meaning of either "Telephone" or "Electricity" depends on how its interpited.
I saw another Type 99 that has a simular plate and it was date of manufactor and by the company and that one's particular manufactor was an electric company.
So its possible its a plate that has date of manufactor model number and manufactor.
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