This came to me with a 10" project scope I bought a few months ago in order to get the eyepiece and finder that were on it...I had to buy it all.
So I have NO idea the make on this triangular-shape mirror cell. It will hold a full thickness 10" primary (and then some height wise). It is made of heavy gauge aluminum and the hardware is steel. Total weight of this unit is exactly 1-pound 15-ounces as seen.
Cosmetics are great, not excellent. There is some paint loss on the rear-facing side. Also, the threaded hole in this area (where you fasten the cell to the optical tube) has some oxidization in the threads. They will need to be cleaned before you run a bolt. Aside from this the hardware is all there and threads-on just fine. Springs work great too. No touch up welds, bondo fixes, dents, or deep scratches.
All nations welcome to bid.