Webley pistol scopes
Quite often come up at reasonable prices (£15-25), but unless you're a collector I don't see the point. They're a beggar to set up (much shimming with foil or neg film needed to get anywhere near zeroed). Then they will loosen off after a few dozen shots.
I've got a few Hurricanes & a Tempest, & much prefer to use the click rear sight they inherited from the Hawk.
Webley Mk3 x2, Falcon & Junior rifles, HW35x2, AirSporter x2, Gold Star, Meteors x2, Diana 25. SMK B19, Webley Senior, Premier, Hurricane x 2, Tempest, Dan Wesson 8", Crosman 3576, Legends PO8.