Seiko's 6139-6010 occupies the intersection of vintage charm and versatility. This particular model from June of '70 retains its timeless design, having made history as one of the world's first automatic chronographs.
 
The dial boasts a captivating sunburst blue color and is accentuated by a blocked silver minute track, featuring the notable "70 Proof" marking that signifies its pioneering status. The hour and minute hands are sleek polished batons, ensuring easy legibility at a quick glance. Adding a vibrant touch of color, the chronograph hands are bright red. The angular chapter is finished in glossy black and adorned with a silver tachymetric scale, injecting a sporty element into an otherwise casual layout.
 
The case exemplifies Seiko's signature style, characterized by well-crafted contours, a broad flat bezel, and the original circular brush finish that remains intact. The 6139A movement that powers the hands has been serviced and demonstrates near-perfect timekeeping, while the chronograph functions operate with crispness and responsiveness.
 
This watch is complemented by the original triple hinged bracelet, further highlighting its authenticity, and it satisfies even the most discerning collectors' criteria.