thanks Christine. Yes I realised on Alfredo's site that they were referred to in conjunction with colour reference only.
I've been doing a bit more digging and there is another pair for sale on ebay, without the white interior and with a rough unground pontil mark. I will be curious to see if there is an influx of these for sale, as the two I have do have a lot of what appears to be natural wear on their bases.
To be fair to the pair I have

the pontil mark is ground very nicely, perfectly centred and round on both pots, but the middle bit probably would have ground through I guess if they ground it any more rather than it just being left. I am curious to know how they would have done the frill round the rim and the black piping (sorry about the wrong term here

) without attaching it at the other end to do so though? How would they have been able to do it ?
They also have a bit of an orange glow under uv.
m