Thank you so much for finding the earlier discussion and to Angela for the details of the Bagley version.
Reading through the earlier posts it seems I have two of the Bagley "Wyndham" type.
My frosted one has.
2 supports for the frog.
A clear blue frog with12 holes. (which it had when I bought it)
The supports are 4.5cms from the top.
Both have.
9, 9, 9, 8, flutes.
Height and length of 6 and 11 inches.
What confused me was that I bought the clear one first, so assumed that was the "standard" Bagley type, without supports.
Then I noticed that Pamela's on Pressglas had supports, so assumed that was Walther.
Thanks so much for the explanation.
One other thing I notice is that all the examples without supports are clear blue?
Perhaps an early trial run by Bagley that didn't work too well, so they added the supports subsequently?