Seiko 5 Automatic Ref. SNK391 (7S26-02F0)
Dress/Everyday Watch · Seiko (Seiko Holdings Corp), entry-level luxury/premium tier known for extreme reliability and value.
Period: Modern Classic (Late 1990s-2010s). Characterized by the 4 o'clock crown and classic 37mm case geometry common to the SNK line.
Type
Dress/Everyday Watch
Brand
Seiko (Seiko Holdings Corp), entry-level luxury/premium tier known for extreme reliability and value.
Movement
Automatic, Seiko Caliber 7S26. 21,600 bph, ~40-hour power reserve, 21 jewels. Non-hacking and non-hand-winding.
Dimensions
37mm diameter, 11mm thickness, 43mm lug-to-lug, 18mm lug width.
Description
An quintessential entry-point into mechanical watchmaking, this Seiko 5 combines formal dress aesthetics with the utilitarian reliability of the 7S26 workhorse movement. The Roman numeral at 12 o'clock provides a touch of class often absent in the more sporty Seiko 5 models, while the 4 o'clock crown ensures it wears comfortably on the wrist without digging into the hand.
Key Features
Applied gold-tone 'Seiko 5' shield logo, 4 o'clock crown, Roman XII index, and day-date complication with bilingual day wheel.
Dial Description
Matte black dial with gold-tone applied indices and a Roman numeral XII at 12 o'clock. Baton hands with luminescent fill. Day-date window at 3 o'clock with gold framing.
Case Material
316L Stainless Steel with a polished bezel and brushed lug tops.
Crystal Type
Hardlex (Seiko's proprietary mineral glass), flat profile. Shows moderate surface scratching.
Bezel Details
Fixed, polished stainless steel smooth bezel.
Crown & Pushers
Recessed push-pull crown located at the 4 o'clock position (signature Seiko 5 design). No pushers.
Bracelet or Strap
Aftermarket black leather smooth strap with a simple tang buckle. This model originally came on a folded-link jubilee-style stainless steel bracelet.
Caseback Details
Hardlex exhibition/display caseback allowing view of the 7S26 movement and the 'Magic Lever' winding system.
Movement Type
Automatic, Seiko Caliber 7S26. 21,600 bph, ~40-hour power reserve, 21 jewels. Non-hacking and non-hand-winding.
Water Resistance
30 Meters (3 ATM). Splash proof but not recommended for swimming or bathing.
Origin & Provenance
Japan/Malaysia manufacture. Movement is in-house Seiko.
Age Estimate
Circa 2005-2015 based on the dial font and 7S26 movement generation.
Cultural Significance
The Seiko 5 series is arguably the most successful automatic watch line in history, credited with bringing mechanical movements to the masses globally after the Quartz Crisis.
Condition Notes
Good condition. The case and bezel show light 'desk diving' scratches. The Hardlex crystal has visible scratches and inclusions. The leather strap is non-original but serviceable.
Value Estimate
$75.00 - $125.00 USD on the secondary market depending on strap/bracelet completeness.
Care & Maintenance
Service every 5-7 years, though the 7S26 is known to run for decades without intervention. Avoid magnetic fields and do not change the date when the hands are between 9 PM and 3 AM.
Similar Watches
Seiko SNKL45 (Stick indices), SNKP21 (Full Roman indices), and the Orient Tristar (3-Star) budget automatic line.
Interesting Facts
The '5' in Seiko 5 stands for five key attributes: automatic winding, day-date display, water resistance, recessed crown, and durable case/bracelet.