Looks to be X Buckleyi True Christmas Cactus to me. but hard to really tell because there isn't any way to tell the size of the segments. Will be larger on Buckleyi than S.Russelliana but it is 1 of the 2 and if there is some pink on the tips of the white filiments then Buckleyi for sure.
and JB, my old eyes are getting bad too.
cliff
