I think it may be one of Obee1's sabers from years ago with the nipple cut off and an extra washer attached.
Edited:
Actually. The description says it's 11.75" long. So, if that's true, then it doesn't match any replica I know of.
Since I'm in New York, I might go check it out before it goes to the block.
Zoom in on the Bonhams site and take a look at the machine marks on the sloped faces of the pommel cubes. Is there a way to get machine marks like that on a manual lathe/mill? Or would it require a CNC mill? Certainly a lathe would not leave marks longitudinally like that.