No.
Or not any obvious way, there might be a small bore gauge number stamped on the barrel - I've seen a little 8.81 - but there is no caliber designation as such. Assuming it is a military weapon, which is what they were mainly making in 1915, the Army knows what ammo is issued, and the troops use what they get. The German army did not use .30 Luger that I ever heard of. I have seen it said that the navy bought some before they got the then-new 9mm in 1904 but have not seen even a picutre of one.
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