Seiko, Ref. 6602-8050, Cal. 6602, Men’s Manual Wind, 1971

Dark Dial with Gold-Tone Seconds and Framed Date Display

The dial gives this 6602-8050 a restrained but distinctive appearance. Its dark charcoal surface shifts toward black depending on the light, providing strong contrast for the applied silver-tone baton markers and matching hour and minute hands. A slim gold-tone central seconds hand adds the only strong warm accent and gives the otherwise monochrome display considerably more visual character.

A framed date aperture sits at 3 o’clock, while the SEIKO signature occupies the upper half of the dial and 17 JEWELS is printed above 6. Fine minute markers run around the perimeter, and the simple no-day layout keeps the dial clean and balanced. The dial shows light natural vintage aging but remains clearly legible, with its printing, applied furniture and dark finish still presenting strongly after more than five decades.

35 mm Stainless-Steel Case with Sharp Early-1970s Geometry

The stainless-steel case measures approximately 35 mm across and 42 mm lug to lug, producing classic vintage proportions with a slightly elongated stance on the wrist. Broad angular lugs extend clearly from the round dial opening, while polished case surfaces and the slim bezel give the watch a cleaner, more architectural appearance than a conventional round dress watch of the same size.

The case remains well defined, with strong edges and clear transitions still visible. A new black leather strap with green stitching has been fitted at the 18 mm lugs, adding a subtle color accent without distracting from the dark dial. The strap is a modern replacement, while the watch itself retains its original watch components.

Seiko Cal. 6602 Manual-Wind Movement with Semi-Quick Date

Inside is Seiko Cal. 6602, a 17-jewel hand-wound movement from the company’s long-running 66-series family. It operates at 18,000 vibrations per hour and provides central sweep seconds together with a date display. The movement reflects a more traditional side of Seiko engineering, relying on daily manual winding rather than the automatic systems that were becoming increasingly common by the beginning of the 1970s.

The date uses a period semi-quick correction system rather than a modern dedicated quick-set crown position. By moving the hands backward into the late-evening range and then forward through midnight, the date can be advanced without rotating the hands through a full 24-hour cycle for every correction. The movement has been fully serviced and is currently running at approximately +5 seconds per day under present test conditions. That figure represents its current measured performance rather than a permanent accuracy guarantee. A 12-month movement warranty is included, and comparable pieces can be found among our manual-wind vintage watches.

A Traditional Mechanical Seiko from 1971

Ref. 6602-8050 was produced at a point when Seiko was rapidly expanding both automatic and quartz technology, yet traditional hand-wound watches still remained part of the company’s range. The 6602 therefore represents the mature end of an older mechanical approach: simple manual winding, central seconds, a practical date display and compact stainless-steel proportions.

This example stands out through the contrast between its dark dial, gold-tone seconds hand and sharply presented steel case, while the serviced movement and measured +5 sec/day current rate make its mechanical condition equally clear. Buyers exploring the broader period can also browse other vintage Seiko watches.