Have a look for a biggish mould marked M on it, for Mosser. It might not be there, which would indicate a later animal.
I'm going to dig around Mosser bunnies and see if I can find this model.
...
Many bunnies later:-
Not much success finding this rather Peter Rabbitty pose, so I tried Fenton bunny images, they do seem to be much more Peter-y. I think you're on the right track.
