I guess I had a thread on my gun a while back, & it has several descriptions of it's features & several pictures... probably best to just add a link...
if your gun, in .410 has at least most of these features, it's probably not one of the "run of the mill" Belgians made for importation to the common "hardware" store chains, as the bulk of them were at the time...
best of luck...
http://thefiringline.com/forums/showthread.php?t=372069
ooops... I forgot that we had discovered ( or at least we were pretty sure ) mine was Itialian??? It was tagged as Belgian by Cabela's gun library