The mark you refer to looks like a chip, certainly enough to get it classed as a second if considered good enough to sell! Does it have a sharp edge to the mark or any clue as to what caused it?
No sharp edges, Frank, and no chips. There are several of these elongated vertical marks (tooling, as Kev suggests) around the neck, and they do look as if they were part of the manufacturing process. The top and base are identical to Bryn's black vase, but Bryn's black looks perfect around the neck area. The aubergine does appear to have similar tooling marks, though they look quite insignificant compared to mine. But it's hard to tell from a photo.
The weight of mine is just over 130gms, heavier than Bryn's black, but height differences might account for that: the photo on Frank's site gives a height of 3.5", if memory serves, and the Millers' example is 4.25". Mine's somewhere in between.
I seem to have opened up a can of worms. Hope we can come to some conclusion!