Well, I can tell you now...his "Resin Cooling Fins" AKA Boba ROTJ Barrel ribbing...
After making about 5 of them for people, those are Golden Armor recast fins. If this happens to be GA even...very well could be, I know Chaucer really went off the radar for a while. But with out a doubt, the exact same as GAs.
EDIT: Looked further down the ebay screen, and his Webley cast, is a GA cast as well.
Either way, I wouldn't purchase from...to risky I'd say..