Seiko 5, Ref. 6319-8100, Cal. 6319, Men’s Automatic, 1977

Seiko 5 Ref. 6319-8100 from 1977 stands out through its deep blue dial with fine diagonal striping, broad 38 mm stainless-steel case and 21-jewel Cal. 6319 automatic movement. Its original watch components are retained, with a new brown leather strap fitted. The movement has been fully serviced and its recorded rate is approximately -6 sec/day.

Deep Blue Dial with Fine Diagonal Striping

The dial gives this Seiko 5 a noticeably different character from the plain silver and sunburst finishes more commonly associated with everyday 1970s automatics. Fine diagonal lines run across the dark blue surface, becoming more or less visible as the watch catches the light. Applied silver-tone baton markers sit cleanly against the darker background, with small aged luminous plots positioned near the outer ends of the hour indexes.

The applied SEIKO name and Seiko 5 emblem occupy the upper half of the dial, while AUTOMATIC is printed discreetly above 6 o’clock. A large framed day-date aperture at 3 o’clock adds the practical calendar display central to the Seiko 5 concept, with the colored day indication providing a small visual accent. Slim luminous-filled hands and a central seconds hand keep the display straightforward and highly legible without competing with the unusual striped dial surface.

Broad 38 mm Stainless-Steel Case with Short Vintage Proportions

The stainless-steel case measures approximately 38 mm across and 42 mm lug to lug, producing a broad, compact stance on the wrist. Its angular shoulders and brushed upper surfaces give the watch substantially more visual presence than many smaller 1970s dress watches, while the short lug-to-lug dimension keeps the overall profile controlled. At 19 mm between the lugs, the strap remains well proportioned to the wide case.

The case retains clearly defined geometry, with brushed surfaces across the top and polished accents around the bezel and case edges. A new brown leather strap has been fitted, adding warm contrast against the cool blue dial and steel case while remaining clearly separate from the original watch components. The combination gives the watch a slightly dressier appearance without losing its distinctly late-1970s Seiko character.

Seiko Cal. 6319 — 21-Jewel Automatic Day-Date Movement

Inside is Seiko Cal. 6319, a 21-jewel automatic movement from the broader 63-series family. It operates at 21,600 vibrations per hour and provides central sweep seconds together with quick-setting day and date functions. The caliber is closely related to Seiko’s well-known 6309 architecture, but with the higher 21-jewel specification used in the 6319 version.

The movement has been fully serviced and is currently running at approximately -6 seconds per day under present test conditions. The figure describes the recorded performance under the stated test conditions, not a guarantee of future accuracy. A 12-month warranty is included.

A Late-1970s Seiko 5 with Strong Mechanical Character

Ref. 6319-8100 comes from a period when Seiko was rapidly expanding its quartz technology while continuing to produce robust mechanical automatics for the Seiko 5 line. The 6319 represents that parallel mechanical tradition: practical day-date functionality, automatic winding and durable 63-series construction in a watch designed for regular everyday use.