The sword, like anything I sell on eBay, could have been returned for a full refund for any reason. It just needed to be returned in the same condition as sent, which this was not.
My feeling about the piece is that the modifications , specifically the possible replacement of the handle and the stitching that was on the tang when I got it, were period done, or at least possibly period done. Of course, I could be wrong, which is one of the reasons I offered an unconditional return. Part of the charm of this piece was the opportunity to be the first person (possibly at least) since WWII to disassemble the thing and find out if it was made by a rare of valuable maker.
Personally, I've grown to be adverse to mucking around with WWII relics, so I probably would have left the piece as is if I had chosen to keep it. I understand, however, that sword collectors like to see the maker marks.
The PayPal dispute was resolved in Geoff's favor, but I've appealed. Some of the evidence that I submitted, including comments from here didn't upload for some reason.
I think this dispute is partly a generational issue. Older collectors from Geoff's and my generation used to not give much thought to pulling military relics apart, switching parts, etc. Younger collectors are mostly adverse to that kind of thing. I've noticed from my sales that "out-of-the-woodwork" stuff gets a significant premium, so I always highlight this if I find something apparently unmodified that hasn't been in a collection before. Unfortunately, this piece no longer qualifies as "out-of-the-woodwork."
Thanks again for everybody's input, including Geoff. The dispute is a drag, of course, but I've enjoyed going through a learning curve on Japanese swords.
Mark D.