Baltany S2081 39mm Military Field Watch — Date & Sub-Seconds

Baltany S2081 39mm Military Field Watch — Date & Sub-Seconds

The Baltany S2081 is a 39mm military field watch powered by the Seagull ST1731 automatic movement — a caliber that combines a sub-seconds display at 6 o’clock with a date window at 3 o’clock in a single movement. The case is brushed 316L stainless steel with a screw-in crown and caseback rated to 100m. The dial uses dual Super-LumiNova: GL Old (warm cream-yellow, old radium style) on the hour markers and BGW9 (bright blue-white) on the hands — two lume colours that create maximum contrast between hands and markers in complete darkness.

Available in matte black and gradual brown sunburst dial, each on a matching leather strap.

The S2081 takes its design cues from the broad family of mid-20th century military field watches known collectively among collectors as “Dirty Dozen” watches — a group of 12 watch models produced for the British Army during and after World War II. The term has become a general collector shorthand for this style of round field watch with railroad minute track, full Arabic numerals and sub-seconds at 6 o’clock.

Key Specifications

Variants — Black and Brown Dial

Matte black / black leather strap — a non-reflective flat black dial with cream-yellow GL Old lume numerals and white-blue BGW9 lume hands. The matte surface absorbs ambient light rather than reflecting it, keeping the contrast between the dial background and the lume numerals high in all lighting conditions. The sub-seconds register at 6 o’clock has its own fine-print minute scale. Paired with a black leather strap for a consistent dark, tactical character throughout.

Gradual brown sunburst / brown leather strap — a radial sunburst dial that transitions from a deep burgundy-tobacco at the edges toward a lighter warm brown at the centre under direct light. The sunburst pattern creates a directional texture that changes character as the wrist moves — under warm light it reads as rich brown; under cool natural light it shifts toward a darker, more muted tone. The gradual brown dial is the more characterful and less common of the two options. Paired with a brown leather strap in a complementary warm tone.

The Dirty Dozen Design Language

The “Dirty Dozen” refers to 12 watch models commissioned by the British Ministry of Defence from twelve different manufacturers during and immediately after World War II. The brief specified a standardised set of requirements: round case, black dial, white Arabic numerals, sub-seconds at 6 o’clock, luminous hands and markers, and a specific set of case dimensions. The result was 12 watches from 12 manufacturers that shared a common design language despite different movements and case constructions.

The design language of these watches — large Arabic numerals, railroad minute track, sub-seconds register, minimal ornamentation — has become one of the most enduring field watch aesthetics in the collector market because it prioritises legibility and utility above all else.

The S2081 applies this design language to a current production 39mm case and adds two features the original specification did not include: a date window at 3 o’clock and 100m water resistance with screw-in crown and caseback. Both additions reflect how the design is used today — as a daily wear piece rather than a wartime issued instrument.

Dual Super-LumiNova — GL Old & BGW9

The dual lume application is the most technically significant feature of the S2081 and the detail that makes it function better in darkness than most single-lume field watches.

GL Old (hour markers) — the “old radium” formulation of Super-LumiNova. In ambient light it appears as a warm cream-yellow, consistent with the aged luminous compound on vintage military watches. In darkness it emits a warm green glow.

BGW9 (hands) — the standard blue-white Super-LumiNova formulation used on most modern dive and sport watches. In ambient light it appears as a cool white. In darkness it emits a bright, saturated blue-white glow that is noticeably different from the GL Old green on the markers.

The practical result: in complete darkness, the hands glow blue-white and the hour markers glow warm green. The contrast between these two lume colours means the hand position relative to the markers is immediately readable — you do not need to interpret which glow is a hand and which is a marker. This is a functional advantage that single-colour lume watches do not provide.

Movement — Seagull ST1731

The Seagull ST1731 is an automatic movement from the Tianjin Seagull Watch Group that combines two complications in a single caliber: a sub-seconds display at 6 o’clock (separate seconds gear train, small seconds hand) and a date window at 3 o’clock. This combination — date plus sub-seconds — is uncommon in affordable automatics. Most movements at this price level offer one or the other: central seconds with date (NH35), or sub-seconds without date (NH38, ST1701).

The ST1731 is self-winding with bidirectional rotor and supports hand-winding via the crown. The date corrector is accessible at the crown’s intermediate position.

Case — Brushed 316L Steel

The fully brushed 316L case finish is the correct choice for a field watch intended as a daily piece. Brushed surfaces show micro-scratches far less than polished ones — the uniform surface texture absorbs light diffusely, which means the fine marks of daily contact are invisible against the same-direction texture of the original brushing. A polished case with the same daily use would show visible scratching within weeks; the brushed S2081 maintains its appearance significantly longer.

The screw-in crown and caseback create a hermetic seal rated to 100m — appropriate for swimming and snorkelling without concern. The 39mm diameter and 46mm lug-to-lug fit wrists from approximately 6.3 to 7.5 inches without the lugs extending past the wrist edge.

What’s in the Box

• Baltany S2081 watch on leather strap
• Leather watch bag
• Strap removal tool
• Portable anti-drop watch box
• 2-year warranty

Who Is the Baltany S2081 For?

The S2081 is built for:

• Buyers who want the Dirty Dozen military field watch aesthetic with a practical date complication added
• Anyone who wants dual-colour lume (GL Old + BGW9) as a functional and aesthetic feature
• Daily wear buyers who need a date window on their watch but want a military field design rather than a dress-sport piece
• Collectors who want the sub-seconds and date combination in a single movement — uncommon at this price point

For a 36mm field watch without the date window, the Baltany W10 is the more minimal alternative — same military aesthetic, NH38 movement, no date.

For a 36mm NH38 field watch with 200m water resistance and hydraulic bezel, the Baltany A11 is the compact deep-rated alternative.

How It Compares

vs. Baltany W10 — The W10 is the cleaner, date-free alternative at 36mm with NH38. The S2081 adds 3mm diameter, date complication, sub-seconds and dual lume at the cost of a slightly larger footprint.

vs. Baltany A11 — The A11 is 36mm with 200m water resistance and hydraulic bezel. The S2081 is larger with date and dual lume; the A11 wins on water resistance and case texture.

vs. Baltany S204035 — The S204035 is also 39mm with similar vintage military character. The S2081 has date + sub-seconds and dual lume; the S204035 offers a choice of Seagull or Sellita movement and amber enamel dial option.

vs. Ditaling DT1521 — The Ditaling DT1521 is larger and more angular in design. The S2081 is the more classically proportioned field watch; the Ditaling is the more contemporary-military option.

vs. Seestern Military Pilot — The Seestern Military Pilot uses a pilot watch case format. The S2081 is the field watch alternative for buyers who prefer the round case and sub-seconds layout over the pilot watch aesthetic.

More from Jewelry Addicts

Exploring military field watches, Dirty Dozen style watches and dual-lume automatics:

• Baltany Watches — Full Collection — all Baltany models at Jewelry Addicts
• Baltany Dirty Dozen Collection Guide — full overview of Baltany’s Dirty Dozen-style range
• Seagull D581 Military Watch — Chinese heritage movement military field watch alternative
• Best Automatic Watches Under $200 — full roundup including field, military and vintage automatics