I havent. I've never tried to grade anything. it just confuses me I guess because I've never tried it and scared if I messed the paperwork up I wouldn't get my coin back.
Looks like it may have been cleaned or polished in the past, which would diminish its numismatic value. It's still 90% silver which makes it highly collectible.
That happens to me ALL the time. But in my case I will just win am auction, spend all credits... Then I'll see something I wanted wayy more. But thanks!