1858 O Seated Liberty, Reverse Die Clash?

Hello CoinTalk!
It's been a while since I've posted, and I hope everyone is well! I picked up this beautiful 1858 O Seated Liberty Half Dollar at a yard sale, and I have two questions:
1. What would one grade this coin at?
2. What is the rift inside of the shield, on the Reverse side of the coin, from?
It is raised and not indented. I've had a couple friends look at it and they said it was an error. Did some research on it as well, but could not find anything about it. I'm not sure and would appreciate it if anyone could help me out. The pics I took are to the best of my abilities; sorry about the lighting. Thank you in advance!
Cheers!

 

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Grade? If not cleaned, AU

Inside the shield: could be a die break

 

Very nice coin! Agree with above, if cleaned it was a long time ago.

 

There are a few on CoinFacts with this same look inside the reverse shield.

 

Treashunt, thank you!

 

Thank you, SchwaVB57! I sure hope it wasn't cleaned..

 

Thank you, Idhair! I checked on CoinFacts, like you mentioned, and saw one similar, but it was a 1856. I appreciate your feedback!

 

Check down this group of images. You should see several. I hope the link works.
http://www.pcgscoinfacts.com/CoinImages.aspx?s=6294

 

How much did you pay for it?

 

Wow! Thanks Idhair! Link worked great. Appreciate it!

 

A Dollar.