That Ektachrome looks absolutely wonderful compared to a few that I have. They've gone entirely orange on me! Those must have been stored in a climate controlled room compared to mine.
Does it say Ektachrome on the mount? It looks similar to some Anscocolor slides I have, they have faded, but there is very little color shift, only a loss of density over all.
Taken a second look, definitly strikes me as an Anscocolor, the shift is not as bad as E-2 and appears to be faded over all.