Hi, to be honest it's 1 of about 25 items (mostly Whitefriars) I have bought over the last week or so, liked the colour, the vertical lines on one side and the horizontal on the other, the seller told me a couple of people had told him it was Sklo, so just put it up on here hoping if it was a known piece it would be easy to get confirmation. The base has an edge the same width as the rim, the pontil mark is oval and covers about 3/4 of the base and has definite age related wear, sorry for throwing you Paul, but at that point I had not really had a good look at it, will post a picture of the base.
Thanks Chris