Help with Broken Hoyal CP Filter

Yes, it must go the right way round - circular polarisers only work one way. Just look through it and one way it will polarise, and the other it won't do anything.

Then there is the orientation, which should either align with, or be at 90 degrees to, the index mark on the rim. If it has one that is, some don't. It doesn't matter that much as you always rotate and align them by eye anyway.
 
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