So I have just bought a HW77K in .177, its a 1031### serial number so this makes it a 1986.
Now what makes me think it could be tickled by Venom is it has the silencer and extended under lever, it is in a very nice adjustable walnut stock which I dont believe is Venom although until I see it I'm not 100% sure.
Thing is, its been chromed? Now I dont think Venom chromed any guns or did they? Anyway I have taken bit of a punt on it at an auction as the stock will be worth a few quid even if the action is a standard unit with added silencer, I'm picking it up next week so will give it a strip down and see whats inside.
Experts, let me know what you think, here is some pics -