The guys above are right, Bodkin on the left, Hills Hornet on the right. Your bow looks to be a 1966 Bear Grizzly and is a GREAT bow, much better than the later design with the rounded riser back, IMO (I have a '67, same bow).
There are a couple of very good sharpening tutorials in the How To forum. The same techniques used for Snuffers and Woodsmans will work with your heads, too. Also, I should be able to hook you up with some fellows in your area. I keep the membership for the UBI; lots of talent there. Do you know Joe Stark in St. Joseph?