Did they use them in the good old days? Do they turn up in old tool collections or catalogues?
I'd imagine if someone wanted to make one of these as a marking gauge back then, they'd have been made out of scrap because they will get marked up and dinged. As hard as it is to even find little used tools, I wouldn't be surprised if you wouldn't find much as far as marking templates or gadgets.
Also wouldn't be surprised if a tails first cutter never marked anything other than square, and on common work, not even that, dividing the space by eye and controlling the angle by feel on the tail cut (or even the pins).
Few at this point will cut often enough to do that in a way that looks aesthetically perfect or close enough to not be obvious.