Seiko Military Chronograph 100M Ref. SNN079P2 (on aftermarket/alternative bracelet)
Chronograph / Field Watch (Military Style) · Seiko (Seiko Group). Positioned as a high-quality, mid-range Japanese manufacturer with a reputation for over-engineering entry-level tool watches.
Period: Modern Tool Watch (2000s-2010s). The design blends military field aesthetics with modern racing chronograph layouts, featuring heavy industrial brushing and utilitarian markers.
Type
Chronograph / Field Watch (Military Style)
Brand
Seiko (Seiko Group). Positioned as a high-quality, mid-range Japanese manufacturer with a reputation for over-engineering entry-level tool watches.
Movement
Seiko Caliber 7T94 Quartz Chronograph movement. Features a 1/5th second central chronograph hand, a 60-minute subdial at 6 o'clock, and a date window. Known for extreme reliability and accuracy (+/- 15 sec per month).
Dimensions
Case Diameter: 42.5mm; Thickness: 11mm; Lug-to-Lug: 49mm; Lug Width: 22mm. It wears true to its size with a flat profile that fits well under sleeves.
Description
The Seiko SNN079 is a rugged, functional chronograph designed for enthusiasts who appreciate military styling. Its matte dial and high-contrast numerals provide exceptional legibility, while the compass bezel adds a field-ready aesthetic. It is a 'set-and-forget' tool watch that combines the precision of Japanese quartz with a nearly indestructible case design.
Key Features
Vertical 'Bi-Compax' subdial layout (12 and 6 o'clock) which is rarer than the 3-6-9 layout; compass bezel; red-accented chronograph hand; and the 100m water resistance rating unusual for non-screw-down pushers.
Dial Description
Matte black dial with 'Military' layout. Features large Arabic numerals at even positions, a 1/20th second sub-register at 12 o'clock, and a dual-purpose 60-second/60-minute sub-register at 6 o'clock. Syringe-style luminous hands and a red-tipped chronograph seconds hand.
Case Material
Bead-blasted or brushed 316L Stainless Steel. The finish is intentionally matte to reduce reflections, consistent with military-spec tool watches.
Crystal Type
Hardlex Crystal (Seiko's proprietary toughened mineral glass). It is flat and set slightly below the bezel for protection; showing minor surface scratches in the image.
Bezel Details
Fixed brushed stainless steel bezel with engraved compass markings (N, NE, E, SE, S, SW, W, NW). This is a decorative/navigational 'Solar Compass' scale.
Crown & Pushers
Standard push-pull crown at 3 o'clock with integrated crown guards. Two pump-style pushers at 2 and 4 o'clock for starting, stopping, and resetting the chronograph.
Bracelet or Strap
Three-link Oyster-style stainless steel bracelet with a combination of brushed and polished finishes. Features a folding clasp with safety release. Note: This model usually comes on a nylon canvas strap; this bracelet may be a secondary addition.
Caseback Details
Solid screw-down stainless steel caseback. Typically features the Seiko 'Tsunami' or brand logo, movement/case reference (7T94-0AS0), and 'Water Resistant 10 Bar' engravings.
Movement Type
Seiko Caliber 7T94 Quartz Chronograph movement. Features a 1/5th second central chronograph hand, a 60-minute subdial at 6 o'clock, and a date window. Known for extreme reliability and accuracy (+/- 15 sec per month).
Water Resistance
100 Meters (10 Bar). Safe for surface swimming, snorkeling, and showering, but not recommended for scuba diving due to the non-locking pushers.
Origin & Provenance
Japan movement, cased in China or Malaysia (typical for the 'P' reference suffix). Seiko's vertical integration ensures high quality regardless of final assembly location.
Age Estimate
Circa 2005–2015. This specific aesthetic was very popular in the mid-2000s Seiko catalog.
Cultural Significance
Represents the 'Everyman's' pilot/field watch. Before the rise of microbrands, these Seiko military chronographs were the primary entry point for collectors looking for rugged, affordable alternatives to IWC or Sinn.
Condition Notes
Very Good condition. There is visible wear on the bracelet links and light scuffing on the bezel edges. The dial and hands remain crisp with no signs of moisture ingress. Lume likely still functional but mid-strength given age.
Value Estimate
$100 - $180 USD depending on condition and presence of original packaging. Value is stable as these are discontinued but still highly sought after for modifications.
Care & Maintenance
Battery replacement every 3-5 years. Gasket checks are recommended every 2 years if used for swimming. Avoid placing near strong magnets (speakers, tablets) as it can temporarily disrupt quartz motor timing.
Similar Watches
Seiko SNDA57 (Three-register version), Citizen Eco-Drive Nighthawk, Hamilton Khaki Field Chronograph (mechanical equivalent).
Interesting Facts
The 7T94 movement is highly respected in the budget-conscious community for its 'sweep' second hand feel when the chronograph is engaged, mimicking a mechanical movement.