Hi , this has a very thin threaded line spiralling it’s form ending in a Stuart like blob.It has a polished pontil and one can feel wear along it’s edge,Surprisingly there a a few bubbles in the glass here and there .The spiral seems almost to good to be done by hand, but I don’t know for certain how it was done ?,it’s also very delicate but seems to have survived intact apart from some very minor nibbles which is surprising aswell if it is an older piece .Any thoughts many thanks .