Speculating, but not really, but the presence of the crest on the stock oval indicates this was made for someone of the nobility. In German-speaking countries, one can swiftly find himself on the wrong end of a lawsuit if one tries falsely passing oneself off as being of the nobility. And that would extend to things like having a crest on one's gun.
Wrong! Everyone in Germany could have a family crest, either an old one inuse since the middle ages or he could design one, provided he did not ape an existing one. But he was not allowed to place a crown on top of the shield! Crowns of different shapes indicated rank, so their use was illegal, if you did not have the rank indicated by the crown. There were many crown shapes from the imperial crown of the Kaiser, real nobility, down to crowns for lower gentry, For example a five-tined crown for a simpple "von" without any higher title. Before you get enchanted over a coat-of-arms or initials with a crown above, you should have a look at http://en.wikipedia.org/wiki/Crown_(heraldry) and try to identify the rank the crown indicates.
Some hopeful Americans sent me photos of guns with a big W under a crown, thinking it must have been owned by Kaiser Wilhelm. I then had to disappoint them by telling them that this crown indicated one of the countless counts only, named Willi or Walter or so.
I would like to see a better photo of the crest, but so far I can only see a helmet over the shield, indicating no rank.