That is an uncommon pattern for British guns. It's a Hufnagel called "Rosen" and has a distinct weld line down the middle of each scroll. The rod-rod welds are wavy and the ribband end welds are straight. I think it is 3 iron but would need a high resolution close up of the pattern to say for sure.

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This is a Remington 'Oxford 4 S.J.'

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