That has to be the absolute worst, most amateur factory engraving I have ever seen! If it weren't for the body/keywork being mostly correct, I'd say it was a fake.
I can imagine the people at the factory... "Hey Bob, do you still remember how to make a Super 20?" "Well, kinda... Hey Fred, how do we make a Super 20??" "Not sure... I think I have a picture here somewhere..."
So they started with a 613 body and bolted on S20-like keywork. It could be a great horn, but I doubt it.