I did a quick survey on Google Images and found a lot, if not a plurality, of the Seamaster DeVille with the 6xx series movements showing the wide spaced Swiss Made. This wide spaced Swiss Made are also on quite a few other models as well.
That S and r style did belong to the 50s, and this is only the second known example on a SD, but the come back of this particular S and r style is not unprecedented at all. In the Speedmaster line, this exact style first and only appeared on the 2915s in the late 50s, but it came back a decade later on a couple of rare editions: the racing dial 145.012 and the solid gold Apollo XI 1969.
The chance that the OP's and the one in the previous thread came from the same redialer is very remote. The chance that that redialer could dig up some old 1950s scripting style then marry it up with a DeVille dial template of a decade later, well, is even more remote.
The lume dots also show the spongy texture appearance indicating older application, so the dial could not be a recent refinish. Only because there are not many of this example around, I think it's fair to say that this could be an unconfirmed original dial variance. And definitely not a confirmed redial.
Same S and r style, a decade apart:
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