Then, at the very least, you know it's an antique revolver, made in Belgium prior to July 1893, by JB Ronge. Hope this helps :-)
PS. This revolver is likely chambered for the 450 Revolver cartridge, and is commonly called an "RIC"-type, because the Royal Irish Constabulary bought lots of them; I wouldn't suggest firing it though, even if you could find some cartridges for it.
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