Re: Need help identifying an old revolver
The Crown/U was not a company mark, it was the German definitive proof mark before 1939; the Crown standing alone is the proof mark for revolvers. Their presence, and the side safety, indicate that your pistol is of German origin, probably made between 1880 and 1914. It is the equivalent of the inexpensive American revolvers of roughly the same period. In Germany before WWI, those guns sold for about 10 Marks, or about $2.50 in (then) U.S. dollars, or about the same price as the American revolvers of comparable quality.
Most of those revolvers were products of the so-called "guild" system, where small shops made parts, which were then assembled by larger shops. Since the product was a cooperative enterprise, no maker's name was put on.
Value? In that condition, probably $100-150, maybe a bit more.