A question about Rockwell 6S Razor

What's on the back side of plate number 4?  Is it 3, 5, 6?  Does someone know?

For me it is 2

2 is on the flip side of 4. The plates are:

1/3
2/4
5/6

Thank you.

2 is on the flip side of 4. The plates are:

1/3
2/4
5/6

Yep. It makes me think they originally planned to have just four settings - 1/3 and 2/4 with just the two plates. If they were going to do three plates then 1/2, 3/4, 5/6 would make more sense. Anyone know if that’s the reason or not?

I guess it should have been a decision that gives you the appropriate blade gap while still retaining the basic shape abd structure

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