Well I'm a graphic designer by trade, so I've a reasonable eye for proportions - and the book jug has near-exactly the same shape, except it seems a little wider around the middle and has a slightly more cursive flare at the base.
It's a pretty well-made jug, but I'm not sure the top-quality (or flair of design) is really there for it to be warranted as a studio design, unfortunately. But conversely, it doesn't feel new - so may a piece contemporary to and derivative of the Whitefriars jug in the book, if indeed that's what it is.
T'is a quandry.