Engravings/stamps/proof marks on model guns?

Anyone have any experience with adding maker's brands, proof marks and serial numbers to their model guns? I'd like to make my C96 and P08 more authentic, replicating pre- WWII firearms. I guess old factory dies are hard to come by, but perhaps some of the markings could be simulated by, say, laser-engraving or similar? Thoughts, anyone?

I've thought about doing something along those lines too. I'd been thinking about acid etching. No idea how feasible it is though....