John, I'm not sure it has been proven that those are Richardon glass? Or I might have missed discussion somewhere

I've had a look through the Harrach book and there is nothing similar in dekor.
Christine now you've said that,actually those feet remind me of feet on the 'lizard' bowls in the sort of sponged gilded effect. Some of those were Webb.
modified to add:
Actually I've just checked my butterflies bowl with lizard feet and it's that bowl that has the sponged gilded effect on the lizards:
https://www.glassmessages.com/index.php/topic,50401.msg284877.html#msg284877I think re-reading that thread on my lizards bowl, I came to the conclusion it was a Webb piece. So linking back around to Christine's suggestion and the sponged gilded effect on my lizard bowl and the op's vase.
I would love to see a close up photograph of the enamelling on your bowl if you have time to do some more photos please?