I was going to say, if it's not a tri case, someone would have to do some impressive work with the 3 correctors
They do look good, although the photo is not in sharp focus. For the sake of argument, though, what would be required? Would it not be possible for a watchmaker to put three holes of correct diameter in a gold case with acceptable tolerances?
So it is the earliest known costumized Tri Compax in the wild 😁