My slab grade would be MS-63. There are marks hidden under the toning, and the tarnish has reached the point where the luster is impacted on the obverse. For that reason, I would pass on this coin.
I've been slow in replying, having a hard time making up my mind, reverse 66, obverse 64, gonna vote 65.
I think it’s a nice looking coin. I don’t see a lot of hits but I imagine the toning a hiding some marks in the photo. I’m going to say MS65.
Only two folks got it right. The color you see at "1636" shows all around the coin, I just can't capture it. These images are what I based the purchase on:
The faces/expressions of Williams and the Indian...well, I think this issue could have been better executed. JMO. Not knocking your coin, just a general observation.