Max's vase is definitely a Rindskopf Hyacinth in a Martelé decor. The Martelé decor is more irregular in shape and form of the pattern, as to simulate a hammered surface. The decor on Keith's piece is quite defined and geometric pattern of diamond patterns. I have not seen this decor from Rindskopf....
In respect to the Kralik MOP pieces, in general the undersides are flat and well finished. The piece in the example on ebay has a very finished and detailed look to it. Also, the diamond pattern on Keith's piece appears to be closed diamonds almost all the way to the center of the underside. It does not appear to be that way on the underside of the ebay piece......
The underside of Keith's is not flat, but appears concave to a degree in the very center.... and the very center pattern is not as clean and tight as the example vase on ebay is.....
Not sure who it is..... these are just some observations....
Craig