Hi Wolf,
No, I do not have a certificate and the name is not inscribed on the underside. It may be that my penguin limited edition was for a specific dealer or shop. I know for instance that Selkirk did limited editions for Yelverton and many paperweight makers have done limited editions for Selman.
I will ask Peter Holmes as I will see him at the PCC Ysart week end. If you wish the information sooner, I am happy to email him.
SophieB