It's a covering, I was actually looking at the site as you posted (you're earlier post got me curious.
As far as I can tell It's serial number matches earliest production in the page. (serial 000201XXXX (I'm not sure about the security of posting a gun serial online, but that should be enough to give you an idea). That puts it 1906-1935, probably late in that period given the very high number.
It has the S instead of the B
It's a type 38 from Koishikawa Arsenal (Tokyo) according to the symbol page.
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The advantage law is the best law in rugby, because it lets you ignore all the others for the good of the game.
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