Knowing the glass itself is better than believing any marks made on it afterwards.
A very long time ago, family did not buy a large Irene Stevens cut piece, because they studied the glass carefully and found a couple of air bubbles in it.
They didn't realise that was absolutely consistent with manufacture at the time it was made and thought it was fake.
I saw those strapped pieces when you first posted than Ardy

- the fakes are awful compared to the real thing. But you might not have seen that in carefully taken pics.