CptCurl: " I have a feeling it was a .450BPE. If it were an early .450NE it would be stamped to indicate nitro proof, probably with the stamp "NITRO PROOVED. The dolls head on his rifle looks like the older pattern normally seen on the BPE rifles." ....." I believe it originally was a .450 with black powder proofs only. At a later date it was bored out to .470NE but it was not re-proofed. Someone simply overstamped the black powder proofs and added non-official "nitro" proofs. Any .470 proofed in England will have the scimitar nitro proof stamp that came into use with the rules of 1904."
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I am in full agreement with everything CptCurl says in his posts regarding this rifle.