You are bidding on a full keyboard replacement for Roland keyboards ( D50 / D 20 / D 10 / S 50 / S 10 ).  This one is surprisingly clean and came out of a hardly ever used Roland S-10 Sampler, that had electronic issues and could not be resurrected.  You can see underneath that it has hardly seen any real playing action.  This keyboard has been tested and all the keys are working.  Please look at all the connectors to make sure it will match with what you need.