Well I don't know if the one described as Caithness IS Caithness....but it is not Whitefriars.
I would also say that the one described as Whitefriars is not Whitefriars either.....I have the genuine Whitefriars one in this shape, and a lot of other Whitefriars soda glass, and not one of them has a ground rim. All have fire polished rims. The proportions of this one listed do not look right either. Emmi