Good morning everyone.
I think this vase with external ribbing may be a 1930s Stevens and Williams product, judging by design, the bottle green colour (not as yellow as shown - it's a slightly darker, more neutral green) and the large ground and polished pontil mark. The lady who sold it to me thought initially that it might be Webb, but changed her mind. I don't think it's Webb either, but any thoughts would be appreciated.
Since my camera is in hospital, I had to borrow one for the photos below, and I couldn't get the pontil mark into proper focus.
Dimensions: 6.5" high; 7.25" rim diameter; 4.25" foot diameter.