quote................."due to not being able to disprove their claim". Doesn't mean you can't politely ask them to explain their reasons for saying Webb. Peachblow was made by factories in the Sates, Bohemia and U.K., some of which is quite distinctive, and some of which is presumably not easy to differentiate i.e. Webb and S. & W. Presumably this house had a reason for saying Webb, and I can't imagine they'd refuse to discuss.
Must be careful what we say about ebay items, and not my area anyway so can't comment on accuracy of description, although the basket weave pattern on the ebay piece appears less pronounced. Might it be opalescent.
I've been through several books and unable to find this surface decoration on anything to do with peachblow, and if you use 'basket weave surface pattern' on the Board's search, there doesn't seem anything like this, which may indicate rarity. With this in mind, it's a shame that sellers of such pieces don't provide provenance for something which must be vastly less than common.
Perhaps this ebay seller is able to assist with some form of provenance.