HOW MUCH.................? I seem to recall reading in some old pre-war pre EMER's (but not Instructions For Armourers), that these F sights were simply converted from standard sights by the gun trade - or very probably, several members of the gun trade because the sight came as a unit and component parts were said to be not interchangeable. That usually indicates a degree of non-interchangeability - or certainly fine hand fitting in my view - if the No32's are anything to go by!

If that is the case, and looking at the most ridiculous prices achieved, then I'm at a loss as to why they haven't been re-produced. It should be an absolute doddle for any tool/pattern maker or competent bench fitter