What is the name of Scrooge McDuck's most prized possession?

Scrooge McDuck's most prized possession is his Number One Dime.

The coin is the first money Scrooge ever earned, making it a treasured reminder of his humble beginnings. In many stories, he keeps it protected and becomes frantic when it is stolen or lost, even though his fortune is vastly larger than the dime's monetary value.

Carl Barks introduced the Number One Dime in “The Round Money Bin,” first published in 1953. Later stories made the coin central to plots involving Magica De Spell, who believes that the first coin earned by the world's richest person can be transformed into a powerful magical amulet.

The dime is often called lucky, but that interpretation varies. Don Rosa emphasized that Scrooge's wealth came from hard work and business ability, not supernatural luck. Thus, its importance is sentimental and symbolic: it represents the lesson that began Scrooge's long financial career.