Guest
A main question here, is are the barrels soldered or brazed together? I'm not certain when brazing started in Belgium, but brazing shows Belgium mfg'r. if present. Scratching between (underside of the) the barrels at the breech end will show yellow(brass) brazing or silvery solder. The trigger guard looks like that on a Belgium single gun I've shot. It was originally a flinter and the under-rib of the 1/2 round/oct. barrel was brazed to the barrel.