Hi There,
Thankyou for taking the time to think about this piece of glass i understand its not always easy to just give an answer, As id said to anne i have owned two pieces both were marked as to the base thats all ive owned, The bowl does have a few manufacturing marks to the inside of the bowl from something touching it while it was being made also there is the odd particle in the glass here and there as ive never owned any old webb just 70s i guess im just wondering what the workmanship/ difficulty might be in producing a piece of this size??