Timing tab confusion

I have seen those too?

The peep hole lines up with 10 after. Which is a lot unless one of the advances is in at idle or there are other markings on the front side of the damper

I always thought it had something to do with a possible crank sensor?

10 after isn't what anyone wants is it?

There are other marks on the damper at 90* intervals.

ETA I'm going to remove it.