
Hi and welcome. I'm sorry I can't help, but this does appear to be a very well made thing. Pinkwater does look good for the signature, (I was trying to make something from Pukaberg, but it doesn't look anything like their work.).
I hope somebody else who knows a bit more about American glass will come along and add their opinion.
Not everybody comes here every day, have a little patience - I'm sure somebody will help you eventually.