Ordonnanzrevolver M1882/87 [3rd issue] revolver, double action, rod ejector
Muller (Geschichte und Technik der europaischen Militarrevolver) states that commercial series of this revolver was made by SIG. However, this example bears no maker's inscription and has a military serial number.
Stamped on barrel & cylinder
Stamped on left barrel lug & left barrel flat & cylinder [6 times]
Stamped right of hammer & release lever & right of trigger & right of cylinder rod