Information on montenegro gasser

[Mikey125]

I’m looking for any information regarding this Montenegro gasser I picked up over the weekend. I found a couple proof marks I have never seen before, Any information on the proof marks, manufacturer ect would be great View attachment 662190View attachment 662192View attachment 662194View attachment 662191View attachment 662193

 

[Painkillers]

It looks like a later commercial model?
https://en.wikipedia.org/wiki/Gasser_M1870

 

[snurge]

Is it supposed to be antique?
I ask because the gun is anonymous and has post 1894 Belgian proofs
I doubt you could get a letter for it