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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Seiko’s Morning Star name applies to two GPS Solar limited-edition references: the larger-featured SSH145, powered by the 5X53 movement, and the SSJ021, listed in the 3X series with the 3X62 movement. Seiko publishes a detailed specification sheet and a 1,200-piece edition count for SSH145; the official SSJ021 listing confirms its identity and movement family but does not provide comparable model-specific specifications.
Which watches are the Morning Star editions?
The two references associated with the Morning Star GPS Solar releases are SSH145/SSH145J1 and SSJ021/SSJ021J1. Seiko’s official French product page identifies SSH145 as a 2024 limited edition; Seiko Hungary’s Astron catalog lists SSJ021J1 as a Morning Star 3X62 Solar GPS limited edition. A specialist watch publication also covered the pair together on February 8, 2024.
They share the Morning Star theme, but they are not interchangeable specifications: SSH145 uses the 5X53 caliber, while SSJ021 is identified as a 3X62 model. Seiko’s available official material establishes far more about SSH145 than SSJ021.
How do SSH145 and SSJ021 compare?
| Detail | SSH145 / SSH145J1 | SSJ021 / SSJ021J1 |
|---|---|---|
| Movement family | 5X53 GPS Solar, confirmed by Seiko’s product page | 3X62 GPS Solar, confirmed by Seiko Hungary’s Astron catalog |
| Edition count | 1,200 pieces, according to Seiko’s product page | Not stated in the retrieved Seiko catalog listing |
| Dimensions | 42.7 mm diameter, 12.2 mm thick, 48.0 mm lug-to-lug, according to Seiko | Not stated for this exact reference in the retrieved Seiko catalog listing |
| Confirmed functions | GPS time and time-zone adjustment; world time across 39 time zones; dual time; perpetual calendar through February 28, 2100; day, power-reserve, satellite-acquisition and reception-result displays; DST; automatic hand-position alignment | Not stated in the retrieved Seiko catalog listing beyond its 3X62 GPS Solar identity |
| Price shown in cited regional listings | €2,800 on Seiko France’s product page and £2,470 in Seiko Boutique UK’s catalog when accessed in 2026; regional listings, not universal or guaranteed current prices | Not stated in the retrieved official listing |
What makes SSH145 distinctive?
Night-sky styling and limited production
Seiko describes SSH145’s black titanium case and bracelet as evoking a night sky. Its dial has a sparkling gradient intended to suggest the sky brightening, while gold accents refer to stars and planets before dawn. Seiko identifies the model as a 2024 limited edition of 1,200 pieces.
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#1 Best Overall
![SEIKO Watch SBXY033 [ASTRON Solar Radio Line Metal Band Men] Shipped from Japan Relased in March 2022](https://m.media-amazon.com/images/I/41yXd-xgoUL._SL160_.jpg)
- Includes individual box, Japanese warranty (1 year), and individual box
- Solar radio wave correction function (receives standard radio waves in Japan, China, USA, Germany, and UK)
- Full auto-calendar function (until December 31, 2099)
- Time difference correction function
- Automatic needle position correction function
Size, materials and water resistance
The case measures 42.7 mm across, 12.2 mm thick and 48.0 mm from lug to lug. Seiko lists a sapphire crystal with super-clear coating, 10 bar water resistance, 4,800 A/m magnetic resistance and a weight of 105 g. Those figures are useful for judging fit and daily-use suitability, but they are SSH145 specifications and should not be assumed for SSJ021.
5X53 timekeeping and power
Seiko lists GPS time and time-zone adjustment, world time covering 39 time zones, dual time and a perpetual calendar through February 28, 2100. The dial also indicates the day, power reserve, satellite acquisition status and reception result. Additional listed functions include daylight-saving time, automatic hand-position alignment, overcharge prevention and power save.
Rank #2
- Since its 1987 launch, the Attesa has delivered dependable performance via expert titanium-processing know-how and innovative chronograph technology, and the latest addition to the collection is no different
- Satellite GPS Timekeeping System with Worldwide Reception Area, World's Fastest Timekeeping Signal Reception Speed From GPS Navigation Satellites - As Quick as 3 Seconds, World Time in 27 Cities (40 Time Zones), 1/20 Second Chronograph Measures up to 24 Hours, Dual Time Zone, Alarm / Day Date, Universal Coordinated Time (UTC) Display, Perpetual Calendar, Daylight Savings Time Indicator, Power Reserve Indicator, Light Level Indicator
- Black Super Titanium with DLC Coating 44.6mm Case
- Anti-Reflective Double Domed Sapphire Crystal
- 100M Water Resistant and Limited Warranty
Without GPS reception, Seiko states accuracy of ±15 seconds per month at 5–35°C. The company gives an operating period of about six months on a full charge, or about two years in power-save mode. These are manufacturer specifications, not a guarantee of an individual watch’s real-world performance.
What is confirmed about SSJ021?
Seiko Hungary’s official catalog calls SSJ021J1 a “Morning Star 3X62 Solar GPS Limited Edition” and places it in the Astron 3X series. That confirms the reference’s Morning Star identity and movement family. The catalog text retrieved for this model does not establish its edition count, dimensions, full function list or price, so a direct specification-by-specification comparison with SSH145 is not possible from those official details.
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Rank #3
- Case Size: 39.00 mm, Band Width: 20, Case Thickness: 9.22 mm
- Solar Quartz movement, 316L stainless steel, Index dial type, Date
- Stainless steel bracelet, Butterfly clasp with push-buttons,INTERCHANGEABLE-QUICK-RELEASE-BRACELET closure
- Water-resistant up to a pressure of 10 bar (100 m / 330 ft): suitable for short periods of recreational swimming and showering, but no diving or snorkeling.
- 2 Year International Warranty
Seiko describes the 3X family generally as smaller, lighter and more efficient, and says the series can include watches under 40 mm. That is a family-level description, not a verified diameter for SSJ021. Check an exact-reference product specification in your market before relying on a case-size figure.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How GPS Solar works—and what to expect
Seiko describes Astron as using GPS network reception for time and time-zone adjustment, with light providing power. In a 2023 release about related 3X62 Astron technology, Seiko said a sunlight-detecting dial can prompt an automatic GPS connection; when the watch is away from light, it can remember the time of its last successful manual connection and attempt reception then. Seiko also notes that regional, time-zone or daylight-saving changes may require manual selection. These are descriptions of related Astron technology and should not be treated as a guarantee that every behavior applies identically to both Morning Star references.
Which one should you choose?
- Choose SSH145 if you want a model with a detailed manufacturer-published specification, confirmed 5X53 dual-time and world-time functions, and a stated 1,200-piece production limit—and its 42.7 mm case suits your wrist.
- Consider SSJ021 if you are specifically interested in the 3X62 Morning Star model, but first obtain its exact-reference dimensions, functions, edition count and local price from Seiko or an authorized seller. The catalog information cited here does not settle those details.
Check price and availability by market
Prices and stock vary by region and can change. When accessed in 2026, Seiko France showed SSH145 at €2,800, while Seiko Boutique UK’s catalog showed £2,470. These are separate regional listings, not a single global price or evidence of present stock. Verify the reference number, local price, seller and availability before buying; an official listing does not by itself guarantee that a retailer currently has a watch to sell.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
