I picked up a drilling and need some help with a maker's mark, FKM.



It also has the following:
J
2484
118,35

I measured the rifle bore at the muzzle and got 9.13mm. At the breech it was 10.89mm. The barrels are marked Krupp.

Thanks

I cannot make anythingg of FKM. But it sure carries test marks of the former GDR, which tell us that the Drilling is a black powder gun and that it has been restored.