In reply to:

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A good point but the makers name on this particular 500 is "Mahillon".

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Well that explains it then, it's the Belgians. I once had a rifle that was a coppy of Holland & Holland made there by somebody who misspelled Holland. They spelled it Hollund & Hollund. This was in the days when Don Shrum was sending over BP rifles and having the proof marks forged to British Nitro proofs.