Two vintage Rolex watches that ordinarily would be worth around $15,000 to $20,000 on the second-hand market are likely to command 10 to 100 times that value according to watch experts. The reason? One was worn by Hollywood legend Marlon Brando and the other by golf champion Jack Nicklaus. The celebrity factor has the power to turn some not-so-sought-after watch models into two of the most expensive timepieces on the planet.

This Rolex GMT-Master Ref. 1675 was once owned by Brando.

This gold Day-Date Ref. 1803 was on the wrist of Nicklaus.

They are two of the top watches slated to hit the auction block in a December sale called “Game Changers” by Phillips auction house.

“It’s a sale dedicated to people who have changed the game in their fields, but also two watches that have changed the game in watchmaking,” Paul Boutrous head of watches for Phillips auction house tells CNBC.

Let’s take a closer look at the two watches experts say will break records for their models.

Marlon Brando' Rolex watch

Jack Nicklaus's rolex watch