I did note before, and your pic shows this clearly Anne, that they're not exactly the same heights.
Or thicknesses.
Finding variation in Caithness is unusual, their Quality Control was very strict. I suspect these were not a very regular sort of thing for them to make, although they do turn up.
They were just an example I know of, which uses this thick foot that is not in the book, Dan has tracked down Loch examples of Canisbay goblets.

We haven't found evidence that the tall goblets in question are not Caithness yet, but we do know there are related oddities and unknowns.
