The dime is a generic white metal coin marked with a large "10" on oneside and the head of a duck on the other side. Scrooge keeps it on a pedestal in his Money Bin.
Despite it being an American coin, Scrooge earned it in Scotland, by polishing shoes while still a youngster. Although it didn't have any value in Europe, it was its origin that made him decide to leave his home in Cottage McDuck and move to the United States, determined to get rich.
As he arrived in America, the Dime, and his kilt and bagpipes, were his only assets, and Scrooge has saved the Dime ever since, as a symbol of the blood, sweat and tears it took to become the richest duck in the world.
The Dime is still Scrooge's most valued possession, but its value is pure sentimental, something others doesn't allways understand or agree on – Gladstone Gander think of it as Scrooge's "lucky charm" (much to his uncle's annoyance), and Magica De Spell wants to steal it and melt it down, believing it to be able to give her magical abilities that will make her the most powerful which in the world.
Behind the scenes
The Dime was created by Carl Barks in 1953, for the comic book story The Round Money Bin, first published in Uncle Scrooge #3.