Bernie...If your looking for Michigan made heads there was over 30 Broadhead Makers in Michigan at one time.
And there was another Panther 2 made in Saginaw,Mi. by Smith Archery, but in 1957 and has convex cutting edge instead of straight edge. It is pictured on page S-7 of "Broadheads 1871-1971 Identification and Rarity Guide, Second Edition".....Bill