Those are great rings. Especially for chasing. Anytime the latewood is 3-4 times as thick as the earlywood, you are golden.
But remember, rings are only one variable. The wood is a little light to be great. It has what are known as lunar rings in it too. Slightly lighter rings within the annual growth rings.
The stave looks a bit deflexed which might mean it is from the compression side of a leaning tree. Tension sides are often thinner ringed but can make for a snappier bow.
From the pic alone, I would rate this a 7/10 for rings and an overall 6/10. But that is better than 90% of the rest of the non-osage staves in the world