Seiko SSH161
Ref. SSH161 · In production
- Case42 mm
- Thick12.4 mm
- Lug-to-lug49.5 mm
- Water res.100 m
- MovementSolar (GPS/radio)
- CrystalSapphire
Overview
The Seiko SSH161 is a gmt watch from the Astron collection. It has a 42 mm titanium case, 12.4 mm thick, 49.5 mm from lug to lug. Inside is a solar (gps/radio) movement (calibre 5X83) with about 6 months (4,380 h) of power reserve. You also get 100 m water resistance, a sapphire crystal and a bracelet.
Who it suits
- Wrists of roughly 16.8–18.7 cm (6.6–7.4 in), by our Watch Finder sizing guide
- Everyday wear including swimming
- Frequent travellers who track two time zones
- Grab-and-go wear without winding or setting
Strengths
- Sapphire crystal resists scratches
- Solar charging with about 6 months (4,380 h) of reserve
Written by Watch.co from the published specs below. These are not owner reviews.
Full specifications
Case
| Case diameter | 42 mm | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Thickness | 12.4 mm | seikowatches.com · 23 Oct 2026 |
| Lug-to-lug | 49.5 mm | seikowatches.com · 23 Oct 2026 |
| Case material | Titanium | seikowatches.com · 23 Oct 2026 |
| Crystal | Sapphire | seikowatches.com · 23 Oct 2026 |
| Anti-reflective coating | Super-clear coating | seikowatches.com · 23 Oct 2026 |
| Caseback | Screw | seikowatches.com · 23 Oct 2026 |
| Water resistance | 100 m | seikowatches.com · 23 Oct 2026 |
| Weight | 106 g | seikowatches.com · 23 Oct 2026 |
Dial
| Luminous material | LumiBrite | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Date | Date | our classification |
| GMT / second time zone | Yes | seikowatches.com · 23 Oct 2026 |
| Power-reserve indicator | Yes | seikowatches.com · 23 Oct 2026 |
Movement
| Movement type | Solar (GPS/radio) | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Calibre | 5X83 | seikowatches.com · 23 Oct 2026 |
| Made in-house | Yes | seikowatches.com · 23 Oct 2026 |
| Power reserve | about 6 months (4,380 h) | seikowatches.com · 23 Oct 2026 |
Strap / Bracelet
| Bracelet / strap | Bracelet | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Lug width | 14 mm | seikowatches.com · 23 Oct 2026 |
Other
| US list price (MSRP) | $2,500 | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Production status | In production | seikowatches.com · 23 Oct 2026 |
| Style (our classification) | GMT | our classification |
Specs are summarised in our own words from the brand's product page. Each row links its source and the date we checked it. Fields we haven't verified are left out rather than guessed.
Variants with the same specs
Same case, movement and bracelet or strap; typically a different dial or finish.
More in Astron
Similar alternatives
Picked with Watch Finder's style tags and sizing.
Questions about the Seiko SSH161
How big is the Seiko SSH161?
The case is 42 mm wide, 12.4 mm thick and 49.5 mm from lug to lug.
What movement does the Seiko SSH161 use?
It uses the 5X83 calibre, a solar (gps/radio) movement with about 6 months (4,380 h) of power reserve.
Can I swim with the Seiko SSH161?
Yes. It is rated to 100 m.
Does the Seiko SSH161 have a date?
Yes, it shows the date.
How much is the Seiko SSH161?
The US list price was $2,500 on seikowatches.com when we checked on 23 Oct 2026. Prices change, so check before you buy.
Will the Seiko SSH161 fit my wrist?
By our sizing guide it sits best on wrists of about 16.8–18.7 cm (6.6–7.4 in). Use the fit checker on this page to test your own wrist.
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