1900's were not normally made in anything besides 7.65mm - the 1906 was both calibers, but not the 1900.
It looks like a 7.65mm and would bet a nickle on it being that caliber. as said above, see FAQ (but if a normal #2 pencil fits easily, its a 9mm, a bit tight, its a 30 luger)
also - I didn't think 1900 - commercial grips were numbered....
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