Mullard GZ-34 F31 smooth plate ID

Tubes Asylum

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I'd like to ID a Mullard F31 smooth plate. No etched code, taller flat top with a dimple, looks like a Philips with a fat base. Identical internal construction (to my eye) to another F31 date code B8D, this tube also has the dome top consistent with a Blackburn F31. The base on each are slightly different.
Is this other tube a Sittard GZ-34 with a fat base?

Edits: 03/07/23

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Topic - Mullard GZ-34 F31 smooth plate ID - SoCalAl 09:46:57 03/07/23 (5)

RE: Mullard GZ-34 F31 smooth plate ID - dogscanskate 05:10:35 03/08/23 (3)

RE: Mullard GZ-34 F31 smooth plate ID - dogscanskate 05:11:39 03/08/23 (2)

RE: Mullard GZ-34 F31 smooth plate ID - opalize 13:27:19 03/08/23 (1)

RE: Mullard GZ-34 F31 smooth plate ID - dogscanskate 05:36:09 03/09/23 (0)

RE: Mullard GZ-34 F31 smooth plate ID - opalize 19:09:02 03/07/23 (0)

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