Seiko Astron GPS Solar Dual Time Chronograph in Silvery Grey Silver Dial Men 44.1mm SSH177J1

Seiko Astron SSH177J1 — GPS Solar Dual Time Chronograph, Silvery Grey Dial

The Seiko Astron SSH177J1 is part of Seiko's flagship Astron collection — the world's first GPS solar watch, engineered to stay accurate anywhere on the planet without ever needing manual time adjustment. This particular reference pairs a silvery grey dial with a super-hard coated titanium case and bracelet, making it both lighter on the wrist and more scratch-resistant than a standard steel sports watch of comparable size.

At the heart of the SSH177J1 is Seiko's in-house Calibre 5X83 — a solar-powered movement that connects to GPS satellites to auto-correct your time zone at the press of a button, no phone or app required. Beyond timekeeping, it adds a genuinely useful 1/20th-second chronograph, a dual-time subdial for tracking a second city, and a world time function covering 38 cities — making it a strong option for frequent flyers who want Rolex GMT-Master functionality with the convenience of solar charging.

Compared to its siblings in the range — the SSH175J1 (Slate Blue) and SSH179J1 (Night Sky Black) — the SSH177J1's silvery grey dial gives it a lighter, more versatile look that pairs equally well with formal and casual wear.

At Zimson, the SSH177J1 is sold with full manufacturer warranty, authentic Seiko packaging, and an invoice — as an authorized Seiko retailer in India since 1948.

Frequently Asked Questions — Seiko Astron SSH177J1

1. What movement does the Seiko Astron SSH177J1 use?
It runs on Seiko's in-house Calibre 5X83, a GPS Solar movement. It's charged entirely by light (no battery replacement ever needed) and syncs to the correct time zone automatically via GPS signal, with an accuracy of about ±15 seconds per month even without a GPS signal.

2. How long does the solar charge last on a full charge?
A full charge gives roughly 6 months of operating power. If the watch is left uncharged after that, it enters a power-save mode where the hands stop to conserve the remaining charge — placing it back in light will resume normal function.

3. What's the difference between the SSH177J1 and the SSH175J1 or SSH179J1?
All three share the same case, movement, and functions. The difference is purely dial and colour theme: SSH177J1 has a silvery grey dial, SSH175J1 has a slate blue dial, and SSH179J1 has a night sky black dial. Choose based on preference — functionally they're identical.

4. Is the Seiko Astron SSH177J1 waterproof?
It's rated to 100m water resistance, which makes it suitable for swimming and daily wear, but it's not intended for diving or high-pressure water activities.

5. Does the SSH177J1 come with an international warranty?
Yes. When purchased from Zimson as an authorized Seiko dealer, it comes with Seiko's official 2-year manufacturer warranty along with original packaging and invoice.

6. What's the case size and weight of the SSH177J1?
The case measures 44.1mm in diameter and 14.4mm thick, with a lug-to-lug of 50mm. Despite the large diameter, the titanium construction keeps total weight to around 110g — noticeably lighter than a steel watch of the same size.

7. Can the SSH177J1 track two time zones at once?
Yes — the subdial at 6 o'clock is dedicated to a dual-time display, so you can keep your home time visible while the main dial shows local time, useful for travel.