Rolex Datejust 31 31 mm 278240SSO Steel Silver

The Rolex Datejust is one of the most storied and enduring watch families ever produced, and the 31 mm sizing occupies a particularly versatile position within that lineage. First introduced in the mid-twentieth century, the Datejust pioneered the automatic date-display wristwatch and set a template that the entire industry would follow for decades. The reference 278240 carries that heritage forward in a thoroughly modern package: 31 mm of Oyster-grade stainless steel that sits beautifully on a wide range of wrist sizes without sacrificing the presence and weight that serious collectors expect.

The dial on reference 278240 is finished in silver, a choice that communicates quiet confidence. Silver dials catch the light without demanding attention, shifting from near-white in bright daylight to a warm, luminous grey in lower light conditions. Index hour markers punctuate the dial with precision and legibility, giving the watch a clean, dressy character that pairs equally well with a boardroom suit or a weekend outfit. The overall effect is exactly what Rolex intended: timeless without being stagnant.

Framing that silver dial is a stainless steel domed bezel — one of the brand's most classical bezel profiles. Unlike fluted or gem-set alternatives, the domed bezel keeps the watch understated and lets the dial do the talking. It is polished to a high sheen and flows seamlessly into the Oyster case, the same waterproof three-piece case construction that Rolex has refined across generations. The Oyster bracelet completes the look, offering a comfortable, secure fit that integrates perfectly with the case lugs.

Power comes from an automatic movement, allowing the watch to wind itself through the natural motion of the wearer's wrist. Rolex's in-house manufacture movements are widely regarded among the most accurate, durable, and thoroughly tested in Swiss watchmaking, and the caliber inside reference 278240 reflects that standard. The result is a watch that rewards daily wear, keeping exceptional time with minimal intervention from the owner.

For collectors and first-time Rolex buyers alike, the Datejust 31 in reference 278240 represents one of the most considered entry points into the brand. Its 31 mm case size is generous enough to read clearly on the wrist while remaining elegantly proportioned. At Bizak & Co., we specialize in sourcing and presenting watches like this one with the transparency and expertise that discerning buyers deserve. Browse our current inventory at bizakandco.com or reach out directly — our team is ready to answer every question and guide you through a confident purchase.