Seiko Alpinist rotating compass alignment

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My Seiko Alpinist SPB489J:

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Odd observation: Here (above) on my Alpinist, the W and E are perfectly aligned, but when rotated 180 degrees to E and W (left to right), they aren't. I can't make sense of this. It may be due to the rotating mechanism and how it maintains water resistance; not a simple translation. Not sure.

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As you can see, there's slight misalignment of the compass only, not…

Seiko Alpinist rotating compass alignment

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