There seem to be a non-trivial number of older damascus tubes out there as we see from the links posted earlier. I thopught Greener were actually making up some guns from vintage tubes. I know Hollands made up a set of barrels for a Purdey hammer gun about 1980. Again, they used existing tubes and the whole exercise was quite successful. The new barrels passed nitro proof and are shooting happily to this day. Davis Winks did the work. Apparently one of the biggest challenges was making and attaching a suitable set of lumps for the straight tubes. I think someone here ought to spend the 600 quid and purchase two tubes to try it again.