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Yep, there is always another aligned avenue of air gun collecting to explore, that is what makes it such a compelling and vibrant interest. Nice story, and a lovely early rifle to see, so thanks for the photos. Yes there are a few of these around this side of the pond, but in essence, the early ones like yours are few and far between on our shores.
Interesting thing to note here, is that it was allegedly the potential power of the early arriving Crosman pump-up rifles to said shores which made the faceless drones that make U.K. legislation introduce an arbatory maximum power limit of 12ft.lb for air rifles (6ft.lb for pistols) before a firearms license would be needed to legally own one -- and so the sub 12ft.lb air rifle industry was born ...