My First Franklin Half Dollar - Could you grade it?

I bought this 1951 Franklin Half Dollar some days ago and I'd posted in @lordmarcovan last contest, but the photos was from seller.
Now I can post better photos of it. They are not so good, but I hope you all can call the grade for me.
In my hands this coin have a strong luster, but I can't reproduce it enough in that photos.
I will appreciate all comments.
Thanks in advance.

 

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AU58

 

AU 53 Check out this site:
https://www.pcgs.com/photograde#/Franklin/Grades
They also have an app for smart phones. on Android just go to the play store and download PCGS Photograde. Probably have it for i phones also.

 

AU-53

 

Great information. I'm already downloading the app. Thank you Thomas.

 

Thank you @Noah Finney and @CoinBlazer for your comments.

 

Along with Thomas' comment and link, I also like to use this PCGS link. I have found it very helpful in giving a good estimation of my raw coins. It goes into a lot of detail. https://www.pcgs.com/grades

 

AU 50.

 

Cleaned AU. A lot of chatter on the cheek.