Hi; Suggestion is to send it to PCGS. They will Grade, Certify and Slab it for him. I believe they charge a Sliding Fee for their Services.but once it is done there will NEVER be a question as to its Rarity, Grade or Value. It will also be Registered in their files so if it is ever stolen then you will have a Photographic Record to show the Police as well.
In 1988 I had several coins stolen and that is exactly how I not only Identified the coins but was also able to catch the thief. He took the coins to a local dealer who I notified of the theft. He called the cops and the busted the guy via the idiots Signature and the guys picture from the stores camera. He did a year for the Robbery. Grand Larceny. It was this clowns seventh conviction. Good riddance to the scum bag.
Lastly, the nick on the edge is a natural wear. If it ad been cut the slice would have been larger and cleaner. It might be a plow strike but otherwise it is natural ok.
Hope this helps. Great Find. PEACE:RONB