Purchased 2 37mm Pre WW1 German brass shells for £5 (bargain, cool militaria).

I am unsure to what they may have been fired from and would really like to know please.

Marks on the base are as follows, from top to bottom.

Shell 1 - Crown with M below it, C/97 98, Roman numerals VI, 1904, KARLSRUHE, 127.

Shell 2 - Crown with M below it, PATRONENFABRIK, Roman numberal X, 97, KARLSRUHE, 2.

I am having great difficulty finding a suitable weapon of the period that would have fired such a round, hope someone can help and i will try to get pictures up soon.

Cheers.