The Oris BC3 (Big Crown 3) is a definitive pillar of the Oris aviation collection, representing a bold, utilitarian evolution of the brand’s historic pilot watches. Launched in 1999 as part of a mission to create a clean, functional instrument for modern aviators, the Reference 7500 is celebrated for its distinctive "industrial" aesthetic and uncompromising legibility. The 40mm multi-piece stainless steel case features a satin-brushed finish to prevent glare in the cockpit, while the black dial provides a perfect high-contrast backdrop for the bold Arabic numerals and the unique vertical day-date window at 6 and 12 o’clock. This layout has become a cult favorite among enthusiasts for its symmetrical and highly readable design, embodying the "Form Follows Function" philosophy that has defined Oris for over a century. Brand: Oris Model: BC3 Day-Date Reference: 7500 Year: Circa 1999–2005 Movement: Automatic (Oris Calibre 635, base ETA 2836-2) Case Diameter: 40 mm Case Material: Stainless Steel (Brushed finish) Strap: High-quality leather or original Oris rubber Dial: Matte Black with Super-LumiNova indices Glass: Flat Sapphire Crystal (Front) / Mineral Glass (Exhibition Back) Functions: Hours, Minutes, Seconds, Day, Date Case Back: Screwed, see-through exhibition case back Box/Papers: Not included A true enthusiast’s feature of the BC3 7500 is its open exhibition case back, which reveals the precision-engineered Oris Calibre 635. This view showcases the mechanical heart of the watch, often featuring the signature Oris Red Rotor—a symbol of the brand's commitment to mechanical purity. As a "Big Crown" model, it features an oversized winding crown designed for easy operation, even while wearing flight gloves. The BC3 7500 is increasingly appreciated by collectors as a "future classic" that bridges the gap between traditional aviation heritage and 21st-century tool-watch design, offering an authentic, independent Swiss-made experience.