Mint means uncirculated, it is not uncirculated. You're just selling a common Kennedy half dollar that is worth all of 50 cents. Can't believe someone would even bid on it.
The coin you show is neither Mint nor silver. Mint is the top grade meaning it was not put into circulation at all. It is as it came out of the mint. Uncirculated is close to mint but has some signs of being touched. At best from the pix, this coin is in good condition. Value? 50 cents
Why are people bidding on this! It's only worth .50 cents. I need it for a hole filler in a coin book, but refuse to bid any more. You really fleeced whom ever wins this auction Andrew. kudos to you. :)