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I think what you have is a private purchase 1872/78 (Ordonnanzrevolver 1872/78 or revolver d'ordonnance modèle 1872/78) Swiss Officers Ordnance Revolver made in Belgium in 10.4mm Swiss Ordnance by the PIRLOT BROTHERS in LIEGE or a copy of such revolver by another Belgian maker. The 1872 model was in 10.4mm Rimfire and the 1872/78 was in 10.4mm Centerfire.
It was in service until 1882 and I would load it on the mild side. The original black powder load was - 12.5 g (193 gr) lead bullet behind 1 g of black powder for a velocity of 185 m/s (610 ft/s) and 213 J (157 ft·lbf) of energy.
I think its more like a fangus and clement type revolver. could be a swiss to but its a small frame being only a 5 shooter. if you take off the grips there might be more info stamped on the frames side under the grips . maby.
Measure the bore, if it is just over 10mm or .41 cal and less than .44 cal then it is a 10.4mm Swiss.
Notice the 10 stamped onto the back of the cylinder, I bet that is because the Chamber throat and bore is 10mm or .41 cal.
A lot of military officer's purchased their own revolvers back then and had them nickelled for lower maintenance and if it could be made a little lighter by losing a chamber they did, most officers of this period carried these revolvers as status or symbols of authority like swords and seldom if ever needed to shoot or use them in action, especially in Switzerland. I have seen a few nickelled French M1974 revolvers as well and one was a 5 shot made in Belgium.
Here is a better close up pic of one (Swiss 1872/78) -