Not compressa, Chris. Agree, it belongs into the karwinskiana group. We could begin to exclude some: not karwinskiana, not confusa, not nagliana or tropica. I remember that I had have once a very similar plant, named praellii (its now in Paul's collection) and these plant is lumped under karwinskiana. I would be nice if we could see a picture from this praellii, so Paul....?