Keith ā The Greater Stourbridge glassworks were probably too small individually to support a full mouldmaking shop in the same way as the huge glassworks in the north. So moulds were likely to have been obtained from a specialist mouldmaker, either to order, or possibly ex-stock for popular patterns. Also moulds were traded and/or swapped, and we have firm evidence of this taking place both within the UK and internationally (certainly between England and Germany in the 1920sā30s). So, for a fairly popular pattern, more evidence is needed than the pattern itself for a definite attribution.
I had a handled mug in this pattern through my hands about three or four years ago, and that carried the Webb acid stamp, so, as Nigel says, Webb is most likely.
You will find a useful and comprehensive illustrated list of Webb dip mould patterns, with approximate dates of introduction, in Hajdamach I.
Bernard C.
