I'd be interested to learn who made that, too. Jeff Cooper experimented with pistol ghost ring sights at one time, but found it didn't work well for him at speed the way the rifle and shotgun versions do.
I've handled guns with the express sights, and find they are faster to acquire from the presentation than anything else I've tried. They are, however, also less precise. That just has to be shooter's preference, there. They do eliminate losing the front sight to one side of a tight rear notch or another, which can happen if you get a poor grip position during the presentation or didn't get it back correctly after a mag change on a gun that makes you shift your grip to hit the mag release.
I have also dealt with two Eliason sight self-disassemblies on the only two Goldcups I've had. The solid elevation pivot pin kept working its way out during firing on my Series '70 GC, and a roll pin substitution stopped that. I briefly owned a stainless Series '80 GC that had the elevation detent pin pop out and disappear in the grass. I don't have a lot of faith in those sights, though the old Series '70 still has his.