In Holden’s collection
Seiko 5 Sports GMT SSK001
The Seiko 5 Sports GMT SSK001 (SSK001K1) is a GMT travel watch from Seiko: a 42.5 mm stainless steel case, 13.6 mm thick and 46 mm lug to lug, with an automatic 4R34 movement and 100 m water resistance.
Going by its 46 mm lug to lug, it should sit within the flat top of a wrist of about 6.2 inches (15.9 cm) or larger.
Research found it at $495 list in the US (checked August 2026) and about $360–574 used (August 2026).
This was my first real mechanical, the first watch I bought after I actually started researching, and for the price it's really solid. It's 42.5 mm but it looks small on my 8-inch wrist, because it's stacked tall with a bezel and a busy dial instead of spread out flat. The bezel is a bit finicky and the jubilee feels light and rattly, so a solid-link bracelet is next.
Specifications
From the research, with the sources for each group of facts. Unknown means no source confirmed it.
| The watch [1][2][3] | |
|---|---|
| Brand | Seiko |
| Reference | SSK001K1 |
| Category | GMT / Travel |
| Production | Current (introduced 2022) |
| Case and size [1][3][4] | |
| Case diameter | 42.5 mm |
| Lug to lug | 46 mm |
| Thickness | 13.6 mm |
| Lug width | 22 mm |
| Case material | Stainless steel |
| Crystal | Hardlex with cyclops date magnifier |
| Water resistance | 10 bar (100 m) |
| Weight | 161 g |
| Movement [1][3][4] | |
| Movement | 4R34, automatic |
| Power reserve | Approx. 41 hours (official); Watch Clicker states 42 h |
| Accuracy | Unknown |
| Bracelet [1][3] | |
| Bracelet or strap | Five-row jubilee-style stainless bracelet, polished middle links |
| Clasp | Three-fold clasp with push-button release and secure lock |
| Price and warranty (US) [1][5][4] | |
| List price (US) | $495 (official US page, 2026-08) |
| Street price (US) | Unknown |
| Used price (US) | ~$360-$574 across tracked listings (WatchCharts, updated 2026-06-29) (August 2026) |
| Warranty | Unknown |
Will it fit?
A watch wears comfortably when its lugs stay on the flat top of the wrist. Here is the 46 mm lug to lug against the flat top estimated for common wrist sizes.
| Wrist | Flat top | Fit |
|---|---|---|
| 6 in 15.2 cm | 47 mm | At the edge |
| 6.5 in 16.5 cm | 51 mm | Comfortable |
| 7 in 17.8 cm | 55 mm | Comfortable |
| 7.5 in 19.1 cm | 59 mm | Comfortable |
| 8 in 20.3 cm | 63 mm | Comfortable |
Check it against your own wrist An estimate, not a guarantee; how the method works is on the tool page.
What the research found
These are the research’s judgments, scored against Holden’s priorities, not his own words.
Strengths
- One of the cheapest true mechanical GMTs on the market — category-defining value
- SKX-descended design with genuine Seiko identity, not an homage
- Wears far smaller than 42.5 mm thanks to 46 mm lug-to-lug
- Solid end links and improved bezel QC versus SKX era
Weaknesses
- Caller GMT on a friction (non-clicking) 24h bezel limits real travel utility
- Hardlex crystal, push/pull crown, 100 m WR — entry-grade execution
- Light stamped-feeling jubilee and clasp
- QC variance: review unit had GMT-hand misalignment
Research scores, 0 to 10
| Execution and feel in the hand | 5.5 |
|---|---|
| Design identity | 6.5 |
| Value at a realistic price | 8.5 |
| Long-term ownership | 6.0 |
| Movement and engineering | 5.5 |
| Wearability and proportions | 6.5 |
| Versatility and durability | 7.0 |
| Fit with Holden's collection | 7.5 |
Also on Holden’s list
Other gmt / travel watches on his list.
- Seiko Field GMT HDB002
- Mido Ocean Star GMT M026.629.11.051.01
- Christopher Ward C63 Sealander GMT 42
- Longines Spirit Zulu Time GMT L3.812.4.63.6
- NOMOS Glashütte Club Sport neomatik Worldtimer 790.S4
Sources
- SSK001 — official product page seikowatches.com · read August 26, 2026
- Seiko 5 Sports broadens its horizons with a new GMT series seikowatches.com · read August 26, 2026
- Seiko 5 GMT SSK001 Review watchclicker.com · read August 26, 2026
- The ULTIMATE Seiko SSK001 Review exquisitetimepieces.com · read August 26, 2026
- Seiko 5 Sports GMT SSK001 Price — WatchCharts model page watchcharts.com · read August 26, 2026
Personal research, not a source of truth. Spotted an error? Email a correction.