360 Harmonic Balancer

So I was cleaning the balancer & to my surprise I found timing marks.. from 10 degrees ATC to 32 degrees BTC. Never seen that before.

Is this normal from the factory?

that is interesting. my 78 E58 replacement engine is marked every 90* but i believe it only goes to 12* BTDC. it's been years since i have looked close at it because it's 6foot up on the engine/transmission rack covered up.

This is off my E58 engine as well.