Rolex vintage reference 6426 Rolex in-house Caliber 1210, 17 Jewels, manually wound, mono-matellic compensation balance, kif-shock absorber, lever escapment, power reserve is up to 58 Hours!!! Even more longer power reserve than the caliber with date! 12xx caliber is proven strong well over engineered by watchmaker and service friendly and also easily can gain COSC time range with just simple adjustment. Is one of the most durable movements ever made by rolex! Highly obtainable for beginner and seasoned rolex collector to grow in collection! You will be proud to display this men's Rolex everyday watch on your wrist ! Easily can accomodate with alligator, leather, grain, nato, zule, suede strap as you like. This rolex can be worn for years to come even pass to your next generation and is perfect for wear with both casual and formal. Rolex old piece is increasingly seek out by watch collectors as they become harder to find from time to time and the price is keep going up too if you notice!