In reply to:

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The whitworth issue is one that sorely needs verification, and it is welcome, no matter how it turns out, as long as there is some backing for the data!

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Very true.

The "data" is VERY clearly backed up, in that it was put there by the Birmingham Proof House, on all true Manchester Whitworth Express rifles!

It's a bit like a poker hand, a FULL SET of authentic proof marks beats a crown (or star) over V anytime.