Doesn't look like a Bushka. The rubber bumper is the wrong color. Also, the silver colored ring in the joint collar leaves too much space to the forearm to be a Bushka, or a Gus, for that matter. Also, the material appears to be aluminum, rather than nickel, though I admit this could be the photo effect. Also, the points do not come close enough at the wrap to be a Bushka, and George almost (but not always) put nickel rings on the outside of the ring assembly above the wrap. Also too much brass showing in the first picture of the shaft joint pilot to be either, though could be a replacement shaft.
I don't think it's a Rauenzahn either, as he would have done points closer together, nickel for the joint rings, and spaced them differently.
Pictures that would help would be the shaft collar at the joint, ferrule, and a straight-on picture of the forearm, to get the point proportionality of the forearm.
This is a tough one. The joint collar looks like an Adam, but nothing else does. The veneer colors come closer to the ones used by George, Gus, and some contemporary makers, but nothing identifies it yet. Tough one.
All the best,
WW