This is a particularly interesting rifle as it has the crossed pennant British military proof mark. Both on the chamber and near the magazine well.

I have seen a few 6.5mm Jeffrey sporting rifles with this same stamping and just missed out on one so marked, here in Australia.

I have also seen another rifle in .375 2 1/2 inch on this forum a few years ago which I commented about a few years ago.

Despite looking for information on these rifles in the National Archives in London I have yet to find any reference to them. I did however find a reference to some 6.5mm barrels being supplied to the Ministry of Munitions in WW1, from Rigby.

Does it have the crossed pennent mark on the bolt by any chance?

Regards

Alan David
Sydney