Single leaf adjustable for windage - interesting, but sounds a mite fragile for an iron sighted dangerous game rifle - in my opinion, of course?

Adjusting the windage is not something that needs to be an exact science - move it over, shoot, move, shoot - repeating as necessary until sighted in - that's it - done. A witness mark with small sharp punch is then all that might be required, if the sight is easily moveable. Record the load that shoots to that mark might be a good idea if you shoot other loads.

Now, in thinking this over and comparing that arrangement to other iron sighted rifles - note with express sights, the standing sight has a slant forwards to 'collect' light or make it visible in the dark bush - exact accuracy is not important at close range, but being able to see the sight and be 'fairly' close is important and good enough.

This light gathering capability is important for the standing, close range sight - as would be a large front sight that is also easily seen, but for the 'distance' shooting sight, the folding leaf, accuracy is important and thus I feel the scallop or light gathering 'device' should be facing the front sight - away from the shooter's eye.