All Seiko lines › Astron › NEXTER
Seiko Astron NEXTER chronograph, 43.4 mm, 13.4 mm thick (5X83)
2 versions of this watch are on Seiko's own sites right now, across 7 regions. Last checked Nov 13, 2026.
No Seiko page for this line prints a sub-series. It is filed under NEXTER because that is where Seiko's Watch Finder files these versions: under the same sub-brand code as watches whose pages print this sub-series.
Estimated US price: $2,900 to $3,100 Seiko US list price.
Retailers ask: no retailer listing matched yet.
Photos are Seiko's own, shown from Seiko's sites. Click a photo to jump to that version.
- Calibre
- 5X83
- Case diameter
- 43.4 mm
- Thickness
- 13.4 mm
- Lug to lug
- 49.5 mm
- Variants listed now
- 2
- Regions
- 7
Listed means the watch was on an official Seiko regional site or store at the last check. It does not mean it is in stock, and it does not tell us whether Seiko is still making it.
Versions listed now
Same case and movement in every row. What changes is the colour, the strap or bracelet, the finish and where Seiko sells it. Seiko's spec sheets don't state dial colour, so a colour appears only where Seiko's US store tags one.
| Photo | Reference | Colour | Strap / bracelet | Case | Edition | Listed in | Seiko list price | Buy |
|---|---|---|---|---|---|---|---|---|
 | SSH183 Also coded SSH183J1 | Not published | Not stated Clasp: Easy-adjust three-fold clasp with push button release 123 g | Titanium (super-hard coating) with ceramic/aluminum bezel | Edição Limitada GPS Solar 2025GPS Solar 2025 Limited EditionLimitált | 7 regions | 2,900 USD USA · Nov 13, 2026 | No seller matched yet |
Where Seiko lists it (7 sites) and its list pricesBuying options (0)No seller offer has been matched to this exact variant yet. | ||||||||
 | SSH185 Also coded SSH185J1 | Not published | Not stated Clasp: Easy-adjust three-fold clasp with push button release 123 g | Titanium (super-hard coating) with ceramic/aluminum bezel | Edição Limitada GPS Solar 2025GPS Solar 2025 Limited EditionLimitált | 7 regions | 3,100 USD USA · Nov 13, 2026 | No seller matched yet |
Where Seiko lists it (7 sites) and its list pricesBuying options (0)No seller offer has been matched to this exact variant yet. | ||||||||
Where to buy
No retailer listing has been matched to a version on this line yet.
Estimated US prices use Seiko's US list price where there is one. Otherwise they are the middle of Seiko's list prices in other countries, converted at rates dated Nov 12, 2026 from ExchangeRate-API (free open endpoint). Those list prices include each country's sales tax, so a converted figure usually runs higher than a US price would. Retailer prices are asking prices on the date shown, not sold prices, and leave out shipping, tax and import charges.
The build
| Movement | GPS solar | Seiko product page |
|---|---|---|
| Functions | Overcharge prevention function Power save function Chronograph up to 12 hours in 1/20 second increments Perpetual calendar to the february 28, 2100 World time function (38 cities) Dual-time function Day display Power reserve indicator Time transfer function (Switching between the main-dial and sub-dial) GPS signal reception function (Time zone adjustment, automatic time adjustment, manual time adjustment) Satellite acquisition status display function Reception result display function DST (Daylight Saving Time) Function to prevent the GPS signal reception (in-flight mode) Automatic hand position alignment function | Seiko product page |
| Power reserve / battery | Operating for approx. 6 months (when fully charged), power save: approx. 2 years | Seiko product page |
| Water resistance | 10 bar | Seiko product page |
| Crystal | Dual-curved sapphire crystal | Seiko product page |
| Lug width | 14 mm | Seiko product page |
| Seiko case codes | 5X83-0AS0, 5X83-0AT0 | Seiko catalog data |
Why these share a page
Every version here is published by Seiko with calibre 5X83 and either the same Seiko case code or the same case size. 4 reference codes lead to this page.
Related lines
- Seiko Astron NEXTER chronograph, 43.4 mm, 14.1 mm thick (5X83)
Same calibre and diameter, different published case
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