I have a Grandis where the signature at the top is transposed left to right, it reads upside down.
There are plenty of "simplifications" seat stay top plugs were common but not commonly known in the 70's.
(think Colnago Super)
First wishbone seat stay example I saw was on a Freddy Parr built bike. Not that he was the first, just not common at all in the 70's.
Brian Baylis related that upon looking at Brian's Eisentraut A, Falerio dismissed it out of hand, as the seat stays were not brazed to the frame in the as he saw it, in the correct manner.