A charity with which I am associated has been given one of the above, complete with system disks, manuals etc. It worked last time it was started (which was some years ago) but has since been stored in a dry garage. It has a BT logo on it.
This is either so old that it is useless, or it is heritage kit which someone, somewhere, is waiting for. Ebay lists bits for it: but this is complete. What is the balance of opinion?