Twin Lakes Coins

Hello everyone! Long time coin collector, newbie wholesale dealer, and first-time poster, so please show me some grace if this doesn't fit the forum (and feel free to point me to the right place!)... Sent in what I considered to be an absolutely gorgeous 1886 50c piece to PCGS in recent months for authentication and grading see link and attached photo... PCGS Certificate Verification Coin Details for Cert #44263953 ...and it came back as Genuine, UNC, Cleaned. I've had 2 dealers look at it, and the only problem one of them mentioned was that it could be artificial toning -- as the coin is darker than what the TrueView imaging would otherwise portray (and he said the dark blues typically are symptomatic of artificial toning). But, that's not what the slab came back as. I keep on staring at it through a 30x loupe and can't find the spot/sots they are referring to, nor can I detect obvious hairlines using the naked eye or a 5x loupe. I'm just trying to learn here, so I'm not opposed to re-submitting to NGC to get a second opinion -- just wanted to see what the chances were in the opinion coming back the exact same (I'm also not a fan of cracking-out, because at least it is in a "Genuine UNC" holder already) Questions: Would NGC Restoration benefit this coin? (I'm too scared to touch a coin this pretty on my own with a drop of anything, and am reticent to clean coins in general.) In your opinion, would NGC's opinion be the same on the details grade? Or, if they see the same issue, would they give it a net number grade? Do coins like this bring good prices at auction? I hear that beautiful toning can make prices go through the roof, but am concerned with the "Cleaned" being stamped on the label I'm a new member at NGC and just trying to decide at what point do I just market the coin as-is... any/all opinions are appreciated... thanks! Aaron Witten Leitchfield, KY