Omega Speedmaster Triple Calendar | Day-Date | Ref 3520.50

About This Watch

he Omega Speedmaster Ref. 3520.50 is a distinctive and highly functional variation within the iconic Speedmaster collection, often referred to by enthusiasts as the “Triple Calendar” or “Day-Date” Speedmaster. This model features a 39mm stainless steel case paired with a bold black dial, offering a sporty yet refined aesthetic. Unlike the traditional Moonwatch layout, the dial is more intricate, featuring day and month windows at 12 o’clock, a pointer date displayed along the outer track, and chronograph sub-dials, creating a dynamic and highly legible design. Powered by the Omega Caliber 1151 automatic movement, based on the robust Valjoux 7751 architecture, the watch delivers reliable performance along with an impressive range of complications. In addition to the chronograph function, it features a full triple calendar (day, date, and month) as well as a 24-hour indicator, making it both practical and mechanically engaging. Finished with a tachymeter bezel and stainless steel bracelet, the Speedmaster 3520.50 offers a unique blend of technical capability and classic Speedmaster DNA in a versatile everyday format. Condition Please review the photos carefully for an accurate representation. Light scratches or signs of wear consistent with age and normal use may be present and do not affect the functionality of the watch. Technical Data Reference: 3520.50 Case diameter: 39 mm Case: Stainless steel Bezel: Fixed tachymeter bezel Dial color: Black Crystal: Sapphire crystal Water resistance: 50 meters / 167 feet Bracelet: Stainless steel bracelet Movement: Omega Caliber 1151 automatic Power reserve: Approximately 44 hours Functions: Hours, minutes, seconds, chronograph, day, date, month, 24-hour indicator.