




PRODUCT DETAILS
The Seiko Astron SSH187 is a limited edition GPS solar chronograph featuring a dark turquoise glitter dial with an embossed spiral pattern inspired by swirling cosmic galaxies.
Crafted with an all-black titanium case and bracelet with super-hard coating, it includes a ceramic and aluminum bezel alongside a dual-curved sapphire crystal with super-clear coating.
Powered by the Caliber 5X83 movement, this timepiece provides high-precision timekeeping with GPS signal reception, dual-time functionality, world time across 38 cities, and a 12-hour chronograph.
Key Features
| Brand | Seiko |
| Collection | Astron |
| Model Number | SSH187J1 |
| Gender | Men's |
| Movement Type | GPS solar |
| Caliber Number | 5X83 |
| Case Material | Titanium (super-hard coating) with ceramic/aluminum bezel |
| Case Diameter | 43.3 mm |
| Case Thickness | 13.4 mm |
| Lug-to-Lug | 49.5 mm |
| Distance Between Lugs | 14 mm |
| Weight | 117.0 g |
| Crystal | Dual-curved sapphire crystal |
| Crystal Coating | Super-clear coating |
| Water Resistance | 10 bar |
| Magnetic Resistance | 4,800 A/m |
| Jewels | 14 |
| Power Reserve | Approx. 6 months (fully charged), power save approx. 2 years |
| LumiBrite | Lumibrite on hands and indexes |
| Clasp | Easy-adjust three-fold clasp with push button release |
Highlights
- Limited edition design featuring an embossed spiral pattern and dark turquoise glitter dial
- High-efficiency GPS solar Caliber 5X83 movement with world time and dual-time capability
- Lightweight titanium case and bracelet treated with a scratch-resistant hard coating
- Dual-curved sapphire crystal with super-clear anti-reflective coating
- 10 bar water resistance and easy-adjust clasp mechanism
Downloads
Frequently asked questions
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PAYMENT METHODS

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SHIPPING & RETURNS
DELIVERY
- We aim to dispatch all in-stock items from our warehouse within 2-5 business days. An email will be sent to you which will include all your tracking information once your order has been handed over to our courier partner.
- If an item is out of stock, we will email you as soon as possible to arrange a full refund or exchange.
- FREE shipping for all orders to any South African address.
- International delivery to Zimbabwe, Namibia and Botswana is available for some brands. Please contact us for a shipping quote.
- Easy 7 days returns and exchanges
RETURNS
If you do not like the product you can return it within 7 days, assuming the item is not worn, scratched or damaged in any way, and includes all the original packaging.
Please contact us for any returns or exchanges
WATER RESISTANCE
Please check the marking on the back of your watch case and refer to the following table to confirm the degree of water resistance of your watch and the preferable conditions of use. A watch’s water resistance is not permanently guaranteed. It is affected by the ageing of gaskets or deformation of watch parts due to accidental shock. To preserve a watch’s water resistance as long as possible, please follow the precautions below:
- Wipe off moisture, sweat or dirt with a soft dry cloth after removing it from the wrist in order to increase the durability of the case back, gaskets and band.
- After using a water resistant watch in ocean water, wash it in fresh water and dry it with a soft cloth.
- Do not wash a water resistant watch while the crown is pulled out.
- Do not operate the crown or press a button when the watch is wet.
- A periodic overhaul service is recommended to check the water resistance of the watch regularly to ensure it’s functionality.
〇:OK, ✕:Not OK
Type of water resistance | For saturation diving | For scuba diving | Enhanced water resistance for | Water resistance for | Non-water resistance | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Water resistance | Professional Diver's Watch | Diver's watch | 20 | 10 | 5 | 3 | ||||||||
Usage example | Accidental splashes and Contact with rain | 〇 | 〇 | 〇 | 〇 | 〇 | 〇 | × | ||||||
Swimming, Yachting, | 〇 | 〇 | 〇 | 〇 | 〇 | × | × | |||||||
Skin diving | 〇 | 〇 | 〇 | 〇 | × | × | × | |||||||
Scuba diving | 〇 | 〇 | × | × | × | × | × | |||||||
Saturation Diving | 〇 | × | × | × | × | × | × | |||||||
REVIEWS
Seiko Astron GPS Solar ‘Spiral Galaxy’ Limited Edition Chronograph Watch
WHY BUY FROM US?
- AUTHORISED ONLINE DEALERThe Watch Boutique is an authorised online stockist for all brands. This includes a full international warranty.
- FREE AND FAST DELIVERYShipping is free for all orders in South Africa. We dispatch all orders within 2-5 business days.
- SECURE PAYMENT OPTIONSIncluding Buy Now, Pay Later plans with PayFlex and Pay Just Now.
- AFTER-SALES SERVICEWe have a full on-site watch repair workshop to take care of all after-sales needs.
