Scrooge's Number One Dime is an item found in Epic Mickey: Power of Illusion. It is Scrooge McDuck's most prized possession. It can be found in London Skies after the quest, The Old Number One has been given to Mickey by Scrooge McDuck himself.
The Dime can be found on a chimney towards the end of the first half of the level. Mickey must swing through ropes and go to the Treasure Chest to get it.