webley Hellfire pcp

[the logun-ator]

now from what i can gather this gun never went into production but one has just come into my possession.
be a nice addition to my webley collection.
side plate reads ''made in sweden by FX, WEBLEY HELLFIRE''
its a std FX design but with pistol grip cocking/loading.i know FX released there own identical to this,cant recall its name.
the storm was one,but i recall another
now there were 4 in the wallis and wallis webley auction, 3 of them had there serial numbers listed while the 4th didnt.
lot no 1181 described as a working mock-up with no sights and no infills in the stock...this one is missing them.
would be nice if this is the one listed,that would make 2 i have from the webley museum sale.
ANYONE HAVE ANY OTHER INFO PLEASE?
THANKS