Cerenne, Vallauris Query

This fish dish is twin to Marie-Christine Treinin's and is stamped Cerenne, Vallauris (sorry, hard to see in photo, impressed upside down under signature) but is signed by ?Bain?. I learn from this forum that one Paul Bain worked at Cerenne. Perhaps it is him, though the style of his work looks very different and the formation of his signature also looks different. And what is the meaning of the smiley or J?
Maybe he did this under Marie-Christine's direction while he had his L plates on and developed his own style and signature later? Or maybe the signature is someone else completely. Posted here for enlightenment and for info sharing.

I’ve split this from the Vallauris thread so members will see it. Queries in the reference sections tend to get overlooked. I’ll merge it back in the Vallauris thread in due course