I examined the EA7 closely.. The keys measure 5 3/16" overall.. this is the exposure... but it appears that the keybed is deeper, in fact it could be moved out another 5/16"... giving it the standard 5 1/2 " exposure.. even the case looks like it was designed to accommodate the 5 1/2"..

Someday I will open it and see if the bed and contact board can be moved out a bit..
I think that is why it is so playable.. the action is the same , the exposure is a bit short..

Probably the same as the Jupiter 50..