I think the best carboot piece so far this year, i think it might be the paperweight by Richardsons shown in the rough drawing in Charles Hadjamach 20th century glass page 373, it's in mint condition with little base wear and measures 4 inches n diameter and 2 1/2 inches in height with a weight of 1426 grams.
Rough pontil.
Any thought's welcome, regards Chris.