English Proof Mark on a MK I .455

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I think er Poyal Navay MK I this has a 1950s onwards proof Mark.
Am I right?
It is on a MK I Webley .455.
It is a nitro proof? as it says 6 tons.
What mark and where, if there are any
are put on a revolver when refurbished.
Is it an "R" next to the lanyard ring?

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