If you label a bat SH, you expect SH Dimensions for the blade. If you label a bat Harrow then you expect a blade with Harrow dimensions. If I sell a bat on ebay as a SH when the blade is Harrow then I will have to refund the buyer if he complains, surely as the item doesn't meet the description.
Now I am not saying the Joker remotely meets my simple example above, but the seller should explain in selling the item that the blade width is Harrow just as he has explained the shortened blade and long handle. Maybe it is explained somewhere, but it's the first I've heard of it.