First of all thanks for your valuable comments!
I think we're close to solving this blurry stamp.
2 M C (G?) K 4 10 But what would be a "G" looks like a "C" for me.
Still, Imperial lugers page 135, there is shown a "C". The pages141, 142 and 145 show examples of a "G". I must admit that it looks like the letter "C" occurs rarely, whereas "G" seems more realistic.
Reg. Sej-gun
