This timepiece is a magnificent artifact from May 1976, as confirmed by the serial number 652872. Known affectionately by elite collectors as the Kakume (Japanese for "Square Eyes"), this reference is one of the most iconic chronographs of the 1970s. As an enthusiast, you'll love the technical soul of this JDM-exclusive variant: unlike export models, this houses the premium 23-jewel version of the Caliber 6138B. This movement is a masterclass in mechanical engineering, featuring a vertical clutch and column wheel for a buttery-smooth chronograph action, alongside the rare capability (for vintage Seiko's) of being hand-wound.

The architecture is quintessentially bold, utilizing a massive 43mm stainless steel cushion case that provides a commanding presence on the wrist. The champagne sunburst dial is a work of high-end JDM art, featuring deep black "square" sub-dials and a specialized orange tachymeter track that adds a vibrant pop of racing heritage. Flipping the watch over reveals the Suwa lightning bolt logo, definitively confirming its status as a top-tier professional-grade instrument. This example is fitted to the ultra-desirable and correct Seiko Speed-Timer 5 Sports bracelet, a mechanical necessity for any serious collector.