Seiko 5 Automatic SNK381K1 7S26-01V0 | NOS
The large Arabic numerals on this Seiko 5 remain the focal point of the dial, even in the dark. By day, they stand out against the black background with their metallic edges; as light fades, the LumiBrite filling them transforms the display into a glowing green time scale. The character of the SNK381K1 lies in the specific form and legibility of these numerals.
**IMPORTANT NOTE: As this item is shipped from within the European Union, you will not be liable for any customs duties within the EU.**
Unlike flat, printed markers, the slightly raised numerals on the dial catch the light along their edges. While the black surface may shift toward an anthracite tone depending on the lighting, the light-colored centers of the numerals remain clearly visible. Small dots marking the minutes form a precise scale around the outer perimeter. At the 3 o’clock position, a metal-framed day-date window integrates seamlessly into the dial, thanks to its black calendar discs. The day display is available in both English and Spanish.
The short, substantial hour hand and the longer, slender minute hand echo the design of the numerals, featuring metallic edges and luminous centers. Interestingly, the small, circular luminous spot on the second hand is located on the short counterweight end rather than the long tip—a detail that gives the movement of the second hand a unique appearance in the dark.
The history of the Seiko 5 traces back to the Sportsmatic 5, introduced in 1963. An automatic movement, a day-date display, and a functional design suited for everyday wear have remained the core hallmarks of this collection. The SNK381K1 continues this tradition with its large-numeral dial and compact steel case.
The 37mm stainless steel case offers a restrained profile, measuring approximately 11mm in thickness. A polished bezel contrasts with the brushed surfaces of the lugs, while the small crown—positioned at 4 o'clock—maintains the smooth, rounded lines of the case. Beneath the Hardlex crystal, the large numerals create an immediate, bold impression that belies the watch's modest dimensions.
The original steel bracelet features wide outer links flanking smaller center links, with a mix of brushed and polished finishes that catch the light in distinct ways. The bracelet, which has an 18mm lug width, is secured by an original folding clasp bearing the Seiko 5 emblem.
Visible through the transparent case back, the 21-jewel Seiko 7S26C automatic movement operates at 21,600 vibrations per hour and provides a power reserve of approximately 41 hours. Seiko’s bi-directional "Magic Lever" system utilizes wrist movement to wind the mainspring. Based on the serial number (315771) and the specific movement revision, January 2013 stands out as the most likely date of manufacture.
Final Thoughts
This SNK381K1 is in "New Old Stock" (NOS) condition—unworn and pristine—and comes complete with its original Seiko box, outer cardboard sleeve, and Japanese-language warranty document. It retains its original steel bracelet and signed Seiko 5 clasp. Known for its prominent, luminous numerals, this model—preserved here with its original components and documentation—offers a rare opportunity to experience the timepiece exactly as it appeared at the time of its initial retail release. The item you are viewing was manufactured in 2013.
IT HAS UNDERGONE A FULL PROFESSIONAL OVERHAUL.
The mechanism has been completely disassembled; every component has been cleaned, lubricated, and precisely adjusted to ensure flawless operation. (It will not require further maintenance for three years, provided it is not exposed to adverse conditions.)
Item Condition: Tested; all functions are in full working order.
