Thats a 38s&w, not antique. He will need to find a way to legally dispose of it unless its a registered 12.x gun passing the requisite legal hoops, and even then the transfer period has closed.
armalytics.ca/firearm/20237-iver-johnson-american-bull-dog
A hacksaw may be his cheapest, most legally safe bit of advice that can be shared on this forum. Sorry.