My grandfather recently passed away and left us a few of his firearms. One of which is this triple barrel shotgun. We do not really know anything about it as there are no papers or serial number. From a discussion I had with him about it a few years back, if my memory is correct, I believe it is chambered in 20 gauge, 12 gauge, and .223. In the same conversation I believe he said it was Belgian made and there were only ever three produced. Any help on the identity and value would be greatly appreciated.