Shall have to check Christine,can't find many images in my books,Gulliver's 1850-1914 has what I think is a perfect description,page 74,the paragraph on opalescent glass,in particular the 'dip-mould' reference.In regards to M's comment on 'Pulled up' machine I don't think it is but is this?A Webb vase(1935-49) that has small 'v' shaped marks three quarters of the way down the body