Seiko has expanded its 5 Sports Field GMT series with the release of two new models, the HDB001 and HDB002, which introduce olive green and khaki beige dials to the collection. These watches retail for USD 450 or EUR 470 and combine a rugged field-watch aesthetic with a functional GMT complication for tracking a second time zone.
New Earth-Toned Dials for the Field GMT Series
The HDB001 and HDB002 move away from the monochromatic black options of the previous SSK023 and SSK025 models. The HDB001 features a dark olive green dial, while the HDB002 utilizes a khaki beige tone. Both models maintain a grained, matte dial surface with raised luminous markers and a framed date window.
These additions shift the collection’s visual identity toward an “adventure” aesthetic, contrasting with the cleaner look of Seiko’s dressier 5 Sports offerings. The dials include a 13-24-hour scale and a red-toned GMT hand that can be adjusted independently in one-hour increments.
Case Specifications and Build Quality
The HDB001 and HDB002 use the same compact case design found in the earlier Field GMT releases. The stainless steel case measures 39.4mm in diameter with a thickness of 13.6mm and a lug-to-lug distance of 47.9mm. Unlike the black-coated SSK025, these new references feature untreated steel with a mix of brushed and polished surfaces.
A fixed bezel with a 24-hour scale and radial brushing protects a curved Hardlex crystal. According to seikowatches.com, the watches offer 100 meters of water resistance, which is standard for exploration-style timepieces. Both versions are paired with a five-link brushed steel bracelet and a folding clasp.
Calibre 4R34 Movement Performance
Inside the case is the calibre 4R34, an automatic movement developed as a GMT evolution of the 4R36. This movement operates at a 3Hz frequency and provides approximately 41 hours of power reserve.
The 4R34 is an “office” or “caller” style GMT movement. This means the GMT hand is the element that moves independently to set the second time zone, rather than the local hour hand. This configuration is common in entry-level GMT watches.
Seiko 5 Sports Field GMT Comparison
| Feature | HDB001 / HDB002 | SSK023 / SSK025 |
|---|---|---|
| Dial Colors | Olive Green / Khaki Beige | Black |
| Case Material | Untreated Steel | Steel / Black-Coated Steel |
| Movement | Calibre 4R34 | Calibre 4R34 |
| Dimensions | 39.4mm x 13.6mm | 39.4mm x 13.6mm |
| Water Resistance | 100m | 100m |
Common Questions About the Seiko Field GMT
Is the crystal sapphire?
The red GMT hand is adjusted independently to track a second time zone, while the main hands show the local time.
The HDB001 and HDB002 are priced at USD 450 or EUR 470.
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