In the old days reference marks were not allowed in barebow.
Some makers laminated the bows such that " factory " rings were visible. Folks had to tape over them to compete in certain classes
I am not aware of current models having such.
Doesnt mean they aint making them.
Personally, having anything off to the side I find detrimental.
Use a sight pin, or the arrow tip. Anything else is just adding lack of focus.
I suppose one could hold the bow out to figure an aiming point using such marks, see where the arrow tip ends up and then convert to using that tip on that spot.
My eyes/ brain dont like doing that.
My focus is out front.
