The factory mark can be off. If it is...that is usually bad. It can mean the outer ring has slipped on the hub and the damper is junk.
But, if the mark is BEFORE the actual engraved line on the damper, that may have been used to set total timing.
To do the math on that, is diameter times Pi divided by 360. Take that number and multiply it by the number of degrees you want to mark. It will show you how many inches away from the OE line you need to be to get 35 degrees.
So.....(remembering I hate math)
7.25*3.14159=22.776527/360=0.0632681*35=2.2143835
All that means is that 2.215 inches around the damper (ahead of he factory marking) is 35 degrees BTDC.
You can do the same for any circle to find out how far around the circle is any degree you want to know.