I don't think you will be able to sell this through Ebay.
You can't avoid the authenticity centre with an item of that value.
Personally, I would take it to a 'bricks and mortar' auction house.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)