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The Seiko Astron GPS Solar SSH187 and SSJ039 are matching 2026 limited editions, each limited to 1,500 pieces, with dark turquoise glitter dials and black-coated titanium cases and bracelets. The key choice is size and function: the 43.3 mm SSH187 adds a dual-time chronograph, while the smaller 41.2 mm SSJ039 keeps a simpler display and costs less at Seiko’s US-listed prices.
SSH187 vs. SSJ039 at a glance
| Specification | SSH187 | SSJ039 |
|---|---|---|
| Movement | Caliber 5X83 GPS Solar | Caliber 3X62 GPS Solar |
| Case diameter | 43.3 mm | 41.2 mm |
| Thickness | 13.4 mm | 12.0 mm |
| Lug-to-lug | 49.5 mm | 48.6 mm |
| Weight | 117 g | 110 g |
| Water resistance | 10 bar | 10 bar |
| Limited production | 1,500 pieces | 1,500 pieces |
| US displayed price | USD 2,900 (Seiko US listing, accessed 2026) | USD 2,400 (Seiko US listing, accessed 2026) |
Dimensions, weights and production figures are from Seiko’s SSH187 product page and SSJ039 US product page. Seiko’s US Astron GPS Solar lineup displays the SSH187 at USD 2,900; prices are market-specific and may change.
What functions does each watch offer?
SSH187: dual time and a chronograph
The SSH187’s 5X83 caliber is the more feature-rich option. Its chronograph measures up to 12 hours in 1/20-second increments, and it offers dual time, world time for 38 cities, a time-transfer function and a day display. The perpetual calendar is specified through February 28, 2100. GPS time-zone adjustment, automatic and manual time adjustment, and daylight-saving-time functionality are also listed by Seiko.
SSJ039: a simpler GPS Solar display
The SSJ039 uses the 3X62 caliber and displays the date rather than adding the SSH187’s chronograph and dual-time functions. Seiko lists GPS time-zone adjustment, automatic and manual time adjustment, a power-reserve indicator, satellite-acquisition and reception-result displays, in-flight mode, and automatic hand-position alignment. Its simpler feature set is the more straightforward choice if you do not need chronograph timing or a second time display.
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- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Which one is smaller and wears more compactly?
The SSJ039 is smaller in every listed case measurement: it is 2.1 mm narrower, 1.4 mm thinner and 0.9 mm shorter lug-to-lug than the SSH187. It is also 7 g lighter. Those differences make the SSJ039 the more compact option on paper, though wrist fit depends on wrist shape and bracelet adjustment as well as case dimensions.
Both watches use titanium with a black hard coating. The SSH187 adds a ceramic/aluminum bezel, and Seiko lists a dual-curved sapphire crystal with super-clear coating; the SSJ039 has sapphire crystal with super-clear coating. Both are rated to 10 bar water resistance.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
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- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
What do the two editions share?
Seiko gives both models a dark turquoise glitter dial with an embossed spiral pattern, paired with an all-black coated titanium case and bracelet. Each is identified by Seiko as a 2026 GPS Solar Limited Edition limited to 1,500 pieces. Limited production describes the stated run; it does not establish future resale value or guarantee collectability.
Both are solar-powered GPS watches. Seiko says GPS satellite signals provide time and location information used to determine the current time zone, while light supplies operating energy. Seiko’s technology overview says Astron 3X/5X watches attempt automatic time adjustment daily and may retry after unsuccessful reception; a GPS time update is not guaranteed in every setting. See Seiko’s Astron GPS technology explanation.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Charging, accuracy and practical expectations
Seiko lists approximately six months of operation on a full charge and approximately two years in power-save mode for each watch. The quoted accuracy of ±15 seconds per month applies when there is no GPS reception and at temperatures from 5°C to 35°C; it is not a blanket statement of GPS-adjusted timekeeping accuracy.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How much more does the SSH187 cost?
On Seiko’s US listings accessed in 2026, the SSH187 is displayed at USD 2,900 and the SSJ039 at USD 2,400, a USD 500 difference. The displayed prices are US-market figures, not a global price comparison; Seiko’s regional listings use different currencies and amounts. Check the relevant local listing or retailer for current pricing, and do not treat a product page as proof of live stock.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
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- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Which should you choose?
- Choose the SSH187 if you want chronograph timing, dual time and world-time functions and prefer the more substantial 43.3 mm case.
- Choose the SSJ039 if a more compact, lighter watch with date display suits you better and you have no need for the SSH187’s extra timing functions.
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.
