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Thanks for the affirmation @Euclid440! Ya, that's what I would have thought, but after seeing new razors with stabilizers near the edge and how some (like Filarmonicas) do tend to taper to the back...

Hm, what about this one? It doesn't seem very worn but the blade does seem to taper considerably towards the heel. Perhaps to compensate for X-strokes or, worse, those arcs that tend to wear the toe...

...that is a Neiström No. 62 so it occurs to me I could answer my own question by seeking out more examples of it. And yup, second shoulder sometimes goes all the way.

So much for that shortcut,...

Typically I assume that when the double shoulder of a razor meets the edge, it's probably quite worn. Maybe even had the heel ground a bit. Because I expect they started out something like this:
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