The Seiko Sky Liner occupies a unique and historically important position within Seiko’s mechanical watch lineup. Originally introduced in the late 1950s, the Sky Liner series was developed as a slim, lightweight, and highly practical mechanical watch, designed for everyday use at a time when reliability and wearability were essential. Rather than competing directly with prestige models such as Grand Seiko or King Seiko, the Sky Liner represented Seiko’s pursuit of efficiency, precision, and modern engineering in a more accessible form. This Ref. 6102-8000 belongs to the later evolution of the Sky Liner concept, produced in the early 1970s, when Seiko had already established its high-end lines and was refining its core mechanical offerings. Powered by the Cal. 6102 movement, it features a practical quickset date operated by pulling the crown to the first position, reflecting Seiko’s focus on real-world usability. The clean dial layout and slim case profile remain faithful to the Sky Liner philosophy: understated design, excellent legibility, and comfort on the wrist. These qualities made the Sky Liner a trusted daily companion for professionals and everyday users alike during Japan’s post-war economic growth. The watch is fitted with a new leather strap, while the original Seiko stainless steel bracelet is included as an accessory, adding to its collectability and versatility. Running at the time of listing. As a vintage watch, stable operation, accuracy, and water resistance are not guaranteed. The watch will be carefully packed and shipped with tracking for safe delivery.