BRIAN
The lower part of the riser seems that it could be an early '60's Damon Howatt, but I don't think it is. Are there any markings on it such as info like AMO, draw weight, and length. Are there any decals? If so, can you post close up PICS?
From what I can see of the rest, it may be a white Hoyt pro rest, but that does not answer your question.