A seriously practical set of open sights I encountered was on, of all things, a take down .250/3000 Savage 1899. It had come back from East Africa.
The factory back sight had been replaced by a fixed stout single wide and shallow V angled back to the firer to avoid reflections and the foresight was a largish bead.
Matted and no white line -Lord Dunsany would have approved.
Gunbearer and tamper proof, practically unbreakable ( air line baggage handlers excepted) and as I remember it grouped at 100 yards about 2.5 inches above the top of the bead. With that cartridge that would give a 200 yard zero and effective point blank shooting to at least 225 yards.
