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Tubes Asylum: Mullard GZ-34 F31 smooth plate ID by SoCalAl

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Mullard GZ-34 F31 smooth plate ID

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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?

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Topic - Mullard GZ-34 F31 smooth plate ID - SoCalAl 09:46:57 03/7/23 ( 5)