I think if you put some white crayon on the action flat to get into the stampings you will find there is a Crown over V and the Perron present. There are some letters to the left of the crown but I can't make them clear enough to read. My guess is a Belgium made gun. There are some other marks mostly obscured by the corrosion which may be decipherable with a little white crayon. Need to lay the barrels on their back and photo the barrel flats and area just forward of the flats. It appears there are some marks but at the present angle they are not readable.