Case size:39 mm ex.crown From lugs to lugs:46 mm Strap:Leather 21 cm including the watch Watch in good working condition Will ship insured and register Seagull 1963 Hand Wind Mechanical Chronograph with Sapphire Crystal #6345G-2901 This special edition watch is an official remake of the 1963 Chinese Airforce chronograph, a unique and classic masterpiece now coveted by collectors nearly as much as the original. This new updated version has a 38mm polished stainless steel case with a sapphire crystal (front) and an exhibition case back. The gold tint creme dial features goldtone numbers and markers and a red star under the 12:00 position. The movement is a Seagull No. ST21 mechanical (hand winding) chronograph with 21,600 VPH and shock protection. Power reserve is about 45 hours on a full wind without the chronograph running. The Seagull chronograph uses a column wheel. In this design, the key component is a small rotating cylinder with teeth at the top, not unlike a castle turret. As the chronograph buttons are pressed, the column wheel rotates and levers fall in between the teeth to drive the functions. The column wheel movement is considered by most watch enthusiasts to be the most desirable, since it requires the greatest skill to design and build correctly and it is thought to be the most durable.