This is Crassula muscosa the form they call GR171Cok.
Crassula muscosa. All 4 plants is the same variable sp.Cok.
Haworthia mirabilis. form from, Bredasdorp
Hawothia cymbiformis v. setulifera.Cok
Pachyphytum oviferum. Cok
http://public.fotki.com/Grootscholten/sansevieria/streaker.htmlI think this is the same as your plant. Cok