Such a cool gun, the HW35, built to last! How has the bore scrubbed up? This was their top model for most of the 20th Century.

You could fit a diopter if you eyes are not so good, still open sights innit? The handling of a scopeless rifle is always better than a scoped one, so long as the light is good & your target is conspicuous a peepsight will match a scope.