Hey...I get to correct NUMPLES... a very rare opportunity for me.
The riser wood is Paduka Wood...whatever that is.
The black models were not Phenolic. As Ray stated, they are stained black. I have one of these black stained models. I assume Ray is correct about it being stained maple, I don't know.
The silver studs sticking out of the riser were for tuning the balance of the riser. To the best of my knowledge, this was the only bow to ever have these. Both upper and lower unit were dialable to get the perfect balance. This was such fine tuning that I doubt anyone ever fooled with it.
During that time period, all manufacturors were coming out with their own gimmicks for precission shooting. Some made it...some didn't...this one didn't.
Hoyt had the "Touque Flight Compensators", Bear had the "Omni Coupler System" and the Phenolic risers, Pearson had the "Mercury Cushions". Most all of them had the inserts for stabelizer rods with each supplying it's own style of stabelizers.
In any case, the Matador had such a huge riser, just the mass of the bow did a lot for "stabilizing " the shot. It is a very stable shooting platform.
Your's seems to be in great shape. I would considere it to be a real collectible because I don't think too many were made.
If he checks in, I am sure Howattman can shed more light, and possibly correct my mistakes too.