Wrong stamp, that one is authentic, it is the Queen Elizabeth 1d trial proof with red overprint that is the forgery. The stamp on the right with the black overprint is also a trial proof, it is authentic. It is the first time I have seen a B.C.O.F. trial proof with a forged overprint, it is so well done that the overprint looks very much like the real thing. The red and gold overprints are rarer than the trial proofs with a black overprint. I enlarged the images so everyone can see the fine detail of a master forger.