For PA screw tips and "commercial" horns, Roland Cadle or Art DeCamp are the go to guys. I'm no screw tip or commercial horn expert, though, so I don't know just how early they can be pushed. For F/I era work, I've been quite taken with anything I've ever seen from John Proud since I first met him up at Ticonderoga in the late 1990s. His work is as good as it gets.