Originally Posted by bulgie

Those are model UF. There's also a knockoff made in Italy, Gipiemme I think, and also a Taiwanese one, so close they're hard to tell from a Shimano, without removing the wheel to see the name stamped in the faces.
They were also sold in retail packaging with a hang tag that says Dura-Ace, so in that sense they're DA dropouts.

I've used a number of them including on my wife's road racer, but I never could figure out what the adjusters were for, so I fill the hole with braze.

They're also a bit weak in the load-path from the chainstay to the axle — fairly common to see fatigue cracking there. They made the window come down too low; the dropouts could have been bombproof if they'd just made the window not come down so low. Here's one where I repaired the crack by brazing, and I filled up the lower part of the window with strong nickel alloy braze filler, that's about as strong as the steel. Easy repair, if yours ever cracks there, but of course it ruins the paint locally.