That is interesting. I've only seen the Belgian and Spanish made little guys but never a South American Mfg. I have seen 2 pc full length stocks on the Spanish but never a pistol grip.I have a .40 cal smoothbore. I got it way back circa 1966 or thereabouts too. Mine was made in Brazil. I got it at the LGS at the time. I used it quite a bit at the time. But I stopped using it when I was in the military in the 1970s. After getting out I only used it sporatically. I do not know if DGW imported and or sold it though. I dug out some photos of mine.I still have it. It was my very first muzzleloader too. It looks like Firearms International imported it. I had very little sportsmanship when I hunted with it. I ambushed the doves or quail on the ground and rabbits when I could. I wanted the meat at the time. I got quite a few birds and rabbits with it too. it is a fun gun to shoot.
Thanks,
O.R.