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1
While I don't have an "official" answer, one reason I've thought that the size difference makes sense is that the size difference helps the shutter speed to be instantly recognizable. That is, when the shutter speed text measures all the same size you are typically actually reading the numerals, but when they are varied (if even so slightly) you are able to ...
2
The smaller 0 on the dial has in my view a much simpler explanation:
If the 0 were normal size than it would touch the number above and below. The smaller 0s appear only on the longer numbers (not on M90, 30, 60 but on 250, 500, 1000).
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