The original Series One's classic and elegant case is CNC machined from 316L high grade Stainless Steel in Biel/Bienne Switzerland. Instead of having an all-polished surface which is much easier to achive, the bezel, middle case and caseback have alternate high-end finishings which are a combination of mirror polished, circular, horizontal and vertical brushed surfaces. All beveled edges sorrunding the case are high polished for a luxurious and radiant look when catches the light. Each caseback is numbered for individuality and traceability.