I suspect Belgian. There should be some kind of proofs on the cylinder. If you can find "elg" in a circle or shield that will confirm it was at least Belgian proofed. S/N's were not commonly used at that time. Most likely the only numbers you will find will be assembly numbers. I'm not familiar enough with the revolver to know if it had a model number or name. Model #'s were not in general use at that time either.
The thing that caught my eye is the grips. I believe they're horn? Beautiful.