Mystery tailstock and steady rest

 From the  "I picked these lathe parts up years ago for reasons long forgotten" department and I have no idea what make they are. They appear to be from a 10" swing lathe, the ways are 3.5" wide centre to centre and there are no identifying marks anywhere. The ways are not South Bend, either for my 9" or the ancient 11". They don't appear to be Atlas either. Anyone have any ideas?