I have what appears to be a Tune TWX-51, but it's fretless. I don't think it came that way from the factory (if anyone knows if they did, I'm interested in knowing the actual answer, I reached out to Tune almost two months ago but received no response). The nut (which may or may not be original) is about a mile high.
I bought this used and had to clean it up a bit (there were stickers on the fretboard that were pulling up, and most of it needed a little bit of cleaning). The one thing I haven't got around to yet is re-gluing the Tune logo on the headstock.
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