great piece - and for those who may not know this is Jobling's butterfly and Panel vase, quite an expensive item in it's day, and I suspect now quite scarce.
Other than this piece I don't know that there are many that might be described as having unusual feet - certainly the 'Open-Footed Vase' with its rocket like base is unusual - although unsure about the reliability of making attributions when comparing uranium colour, but you may well be correct.
The fact that Steven hasn't commented may well be confirmation that this has nothing to do with Jobling.
Regret I've no idea whether Baker & Crowe show every Jobling pattern/design, or if there are some shapes, for whatever reason, not in their catalogue.