The Rolex Datejust reference 78240 is a highly sought-after midsize (medium) 31mm time-piece produced from the late 1990s through the mid-2000. It serves as a versatile gender-neutral or ladies' model, striking a perfect balance between standard ladies' sizes and traditional men's sizes. Pairing this reference with a white dial delivers a clean, timeless aesthetic.
Case Diameter: 31mm (often referred to by collectors as "Midsize" or "Medium").
Material: Entirely constructed from high-grade stainless steel (Oystersteel).
Bezel: Smooth/domed stainless steel bezel.
Movement: Powered by the Rolex Caliber 2235—a highly reliable, officially certified chronometer self-winding movement with a quickset date function.
Crystal: Scratch-resistant sapphire crystal featuring the signature Cyclops magnification lens over the 3 o'clock date window.
Water Resistance: Screw-down crown ensuring waterproof protection up to 100 meters (10 ATM).
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