I believe those 'express' sights were used more for 'up and bang' (dangerous game) rifles - the wide vee didn't hide/obstruct the sight picture and the front bead sat above the vertical platinum line inlet into the rear sight. I've had them on a number of guns I've owned - including the gun I'm shooting now - an E. M. Reilly sporting snider. That gun also has the platinum line inlet into the 100, 200 and 300 yard leaves.
I also have a flintlock with Amercan style 'opens' from the period - an ugly 'U' with 'raised ears' either side to hide the target. I took a file to those and got rid of those 'ears', then I filed a wide 'Vee' and put a fibre optic up front I could actually see.
I got a fibre optic on the snider as well - it glows in the dark of the bush.
With those wide 'Vees' - your eye just gets drawn to the centre naturally, just like with an aperture ............. if you can use them.
My bead sits level with the top of the rear Vee if I'm down the range and thinking about it. If I'm in the bush and not 'thinking about it' - I dunno where it sits.
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