A mystery japanese cartridge shell with unusual mark

hey everybody im Aden from China,i just bought a japanese shell last week and found it quit mystery.The shell itself is the same form as the japanese 25mm Hotchkiss AA round and its transform into a vase,LOL :)
the seller who has no idea with ammunition said it was from shipped from japan wich belongs to Taisho era.
but i found its base has only one Naval mark as the others shell has,no more others marks or numbers,
im confused about it and wonder what history is behind??
is it really a japan Taisho era stuff? why there is no more mark at the bottom?
thanks for your patience to read.
Aden

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This case is a 25x163 Type 96 AA gun made by Kure Navy Arsenal.
Japan adopted it in 1936 so too late for Taisho era which ended in 1926.
It was made post 1943 when headstamp markings showed only the acceptance marks and no longer showed the S (Showa month over year dates).

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Wow,great thanks to ron and i konw better about this and the history behind :P