Introducing Certina DS First (ref. C0144171605100), a contemporary classic shaped by careful watchmaking know-how. The exterior is thoughtfully executed: measuring 41 mm in diameter, with a thickness of 12.5 mm, defined by a round silhouette, paired with a rotating, 0-60 (dive) bezel. The caseback is closed, and the crystal is sapphire, delivering water resistance to 20000 meters. At a glance, the dial balances texture and clarity: a black tone, framed by stick / dot hour markers, and stick hands. At its heart beats a proven engine: the 251.262 caliber. With considered ergonomics, it feels composed during extended wear. Brushed and polished elements play with light to emphasize crisp geometry. For buyers researching specifications and real-world impressions, this reference stands out for coherent design, dependable mechanics, and lasting relevance within modern horology.