I've seen Palomino bows like that wood - I can tell you that the Lord Mercury bows, upper line Sovereign bows etc all had incredible woods in the risers. That bow you have is ultra cool IMO because its old, and clean -but its likely not a highly collectible bow. I actually had a demo model Mercury that I EBAY'd back in the day ...... one of a kind proto-type. Cool bows.

String it and shoot it - as LBR about string choices, he'll get you set up right.