Like the Mark Series of Speedmasters, the 125 is a brutish iteration. It measures 42mm in diameter (45mm including the crown) and 51mm lug to lug. It’s also 16mm thick. To look at it, you might think someone chopped it out of a solid block of 316L stainless steel. Tonneau-shaped and predominantly brushed, the watch sports a finely polished chamfer along both the top and bottom edges of the mid-case. The stationary bezel is also buffed to a mirror-like shine.