I've seen Caerleon in different colours, from pale to dark, it was the mention of the prunts in combination with a pitted irisedcent surface that made me swoop so dramatically.

I've dug out Lesley Jackson's 20th Century factory glass, there are 3 images of paler stuff there, (p196) and a prunt is shown, but it doesn't actually look very lion-y. It appears to have three oval blobs in it.

The Caerleon I have handled has been thick and heavy glass.

Can we see a photo of your lion prunts, please?