Bussey prototype air pistol?

Bussey prototype air pistol? 

John Griffiths, author of The Encyclopedia of Spring Air Pistols, says: "My own researches suggest that... there is a connection to George Bussey, who was probably responsible for the first British spring airguns to be marketed, dating to the mid 1870’s. Bussey was evidently aware of the work of Simonon in Belgium at the same time, and copied some of his design features. Simonon in turn seems to have adopted the Quackenbusb loading system in his pistols. I have looked at a range of similar looking antique spring air pistols, some prototypes, that have come to light over the years, which involve combinations of such features as: a detachable barrel for loading; a slidiing barrel with loading aperture as per Quackenbush, a barrel-retaining screw under the barrel; cocking by direct pull from the back or by pushing from the front. Given that all these guns have turned up on the UK market, rather than on the continent, and all are certainly made pre-1900 when Bussey was the only Brit making and experimenting with spring air pistols in the 1870' and 1880's, then I would say that the unknown pistol, shown at the top here, was probably another Bussey experimental prototype."