Seiko Supers are not my expertise, but I highly doubt it would be a redial. They're cool watches, but not exactly high value ones, so I wouldn't expect someone to try to make money out of redialing them. I also doubt the dial was originally salmon coloured. That's not a common colour in Seiko's catalogue in this period, if it's there at all. I suspect it was originally something along the lines of cream coloured, beige or off white. The patination is fairly even, but not consistent. Or at least it doesn't look consistent around the markers and if you look at the edge of the dial between 1 and 4 in your first two photos.
Having said all that, I think it's a lovely looking watch overall, regardless of what colour it originally was or wasn't.