This timepiece is a magnificent artifact from the 1970s, representing the bold, architectural transition of Omega into the modern era. The reference 166.128 is defined by its massive, high-grade stainless steel "case-in-case" construction and a breathtaking deep navy blue sunray dial that exemplifies the era's sophisticated, sporty aesthetic. It is powered by the legendary Caliber 1020, a high-frequency mechanical masterpiece engineered to vibrate at a blistering 28,800 beats per hour, ensuring a sweep second hand that glides with surgical smoothness across the dial.

The architecture is quintessentially robust, utilizing a specialized "Unishell" system where the movement is housed in a separate capsule before being pressed into the outer case, providing superior protection against the elements. The dial is a work of high-end Swiss art, featuring hand-applied baton indices with luminous inserts and a framed date window at 3 o'clock for the ultimate executive utility. Flipping the watch over reveals the iconic Seamaster Hippocampus medallion, definitively confirming its authentic Swiss Made heritage and its status as a professional-grade instrument. This is an essential acquisition for an elite collector who appreciates 1970s industrial design, the mechanical soul of a hi-beat heart, and the bold, heavy-metal presence of the Seamaster Cosmic 2000.