Belgian revolver for the German market
The safety lever arrangement is similar to the German "Reichsrevolver".
The trigger, trigger bow and the form of the grips look Belgian.
The caliber is too small for a military revolver of the late 19th century.
The marks are German proof marks post-1891.
I think this is a Belgian revolver made for the German market and hence proofed in Germany. I have an old catalogue from 1908 that shows several similar models, with fanciful descriptions such as "officer's revolver", "police revolver", "constabulary revolver". The German market throws up plenty of these things, and they do not have much value unless in A1 condition from a known maker. On this example, the cut-out for a nameplate reduces any value it might have.
Examine the cylinder very closely. There may be a Liege proof mark on the back face. Look under the grips for a possible maker's mark.
Liege was a hive of small companies making copies of everything American in handguns, and those copies vary from rough to excellent. And sometimes they even cheekily copied the American names! I therefore suggest that you examine all items shown here and do not assume that what looks like, say a Smith and Wesson, is indeed such a piece - even if it has the name on it!
Sorry to sound negative - as a result of experience - but I imagine that you would like to avoid trouble with a future purchaser who might feel that he has been defrauded. And that hoard (it does not seem to have the "theme" of a serious collection) looks as if the owner went for quantity rather than quality. In this case, the motto should be not only "caveat emptor" but also "caveat vendor"!
