That's a high dollar coin whether it grades or not. You might want to post it on the LSCC Seated Dime forum and see what the experts say about the value of an 1843-O dime in that grade. It belongs on the banner, though most here do not recognize it as a key date. PCGS certified AU50 and AU53 coins of this date sold at Heritage at $10,350 and $14,950 recently. If it slabs Genuine- AU details, it could still be in the $1,000 to $5,000 range, in my opinion. That's why I voted Banner for it!