Standard, but nice, Strathearn it is. That the bid came from a newby with no feedback tells you everything. I wouldn't take the bid seriously. The "winner" has been a member since February 2004 and has never won or sold anything and has zero feedback. My guess is that it's just a prank bid. Or a typo on the part of the buyer.
Or maybe, if it is a real bid and since the "winner" is from Luxemborg there's an awful lot of money laying around in that tiny place. If the "winner" is serious, then it might be a matter of him/her thinking and insisting (erroneously) that the weight is something it isn't. The sellers can be easily contacted because they are British paperweight dealers with a sales website of their own. I'd love to ask Helen or Alan in a few days if the sale went through.