Rainbow '55 Washington Quarter

Hey guys, I don't know much about grading quarters so I thought I could source the forum for some insight. Here's a cool rainbow '55 of my son's for discussion. Any insight on grade would be appreciated.
I was thinking XF40 (based on photograde comparisons) but the reverse seems better than that. I fully realize it matters very little in terms of value, but I'm just trying to learn.

 

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Gut tells me AU, but I'm lousy with these........

 

Mark, I'm right there w/ you at 40 but it looks suspicious to me, overall.

 

Suspicious in what way?

 

I'd call it AU50 due to the wear on the curls in front of the ear.

 

Sorry, as if it were wiped/cleaned up and later toned. Who knows though?

 

Either way, I love the look and it's one of my son's favorites. Thanhs for the input though.

 

That's what counts.