The Rolex Cellini Prince (Reference 5440 / 5440/8) is a historically significant, Art Deco-inspired luxury dress watch produced by Rolex between 2005 and 2015. This specific variant stands out as a rare, rectangular-cased piece featuring an exhibition sapphire crystal caseback—a design feature Rolex historically avoided on almost all other models.

  The reference 5440 is an homage to the original 1920s Rolex "Doctor's Watch," so named because the large, separated seconds dial allowed medical professionals to easily time a patient's pulse. Because of its unconventional rectangular shape and lack of an Oyster case, it is widely considered "Rolex's best-kept secret" among collectors who want a pure, mechanical dress piece that breaks away from standard sports watch aesthetics.

• Case Dimensions: 28.0 mm width x 47.0 mm length.

• Case Material: 18k solid yellow gold featuring distinctive sunburst-pattern engraved sides and high-polish finishes. 

• Movement: Rolex Caliber 7040 manual-winding mechanical chronometer movement with a robust 72-hour power reserve.

• Dial Aesthetic: Champagne "Rayon Flamme De La Gloire" or "Clou de Paris" guilloche texture. It utilizes an asymmetric layout with a white hour/minute subdial featuring gold Roman numerals on top, balanced by a distinct running seconds subdial at the 6 o'clock position.

• Caseback: Transparent sapphire crystal exhibition back, showcasing a highly decorated rectangular movement specifically finished to mirror the texturing on the dial face.

• Strap & Clasp: Typically paired with a premium black or brown alligator/crocodile leather strap secured by a heavy 18k yellow gold double-deployant butterfly clasp.