This gun is beautiful and while being Germanic, has some uniquely British characteristics such as the bolted safety or the front sight hood a la Westley Richards, not to mention the bottom rib treatment at the muzzle.
Another interesting fact is that the leaves are marked in Yards.
That is absolutely unnatural for a German gun.
Either it was built for the UK market, or it has been redone or finished in the UK.
The caliber choice is interesting and might shed more light on either possibility.
Best regards,
WC