friend asked me to dispose of this for him, he says it's a shopsmith tailstock - I know some of you folks use shopsmiths, maybe it's useful - here's the auction link (at least the starting price is cheap) -
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I have a handful of saw fences and router fences that he also asked me to dispose of, so if you want those kinds of things, look at my auctions tomorrow or later - this is the only potentially lathe related thing other than a replaceable point #2 MT live center (but it's really for metal working and, though with a 1/2X13 thread, it coudl be handy for wood working also