Thanks for the info guys, I actually thought it was a converted .45, in fact it's a MKIV 70 series super 38; converted to 38 special. Its my dad's gun, one of a set of 3 Giles bulls eye guns. He's been having a very hard time finding mags for it so I told him I'd give him a hand. He's the second owner of the set and has had them since the early 80's; I'm surprised he's never had to try and get mags till now. Clark's website shows a couple different mags for 38 special, I'm going to give them a call and hope one will work. Thanks,
Mike