This looks like an Old Hickory model 7-12 butcher's knife. It has been discontinued. It looks like the blade has been modified from the standard profile to add that "false upper edge".
I'm not a fan of the Chicago Cutlery knives or the Old Hickories. The Old hickories have a very wide acceptable harness range from the manufacturer (HRC 53-58). If you get lucky and find a harder one, then good for you. I read that Chicago Cutlery made it's name in the meat processing industry in chicago based on their carbon steel cleavers and professional butchers knives. The stainless steel Chicago Cutlery knives that were all the rage in the '70s are supposed to be no better than the cheap Chinese-made SS knives available today. Not that my opinion on the matter should dissuade you from using them for projects.
If you want real high-quality American-made carbon steel kitchen knives, I would suggest keeping a look out for old Dexters and Lamsons (carbon steel models only). They are fantastic.