Seiko has officially unveiled four new Astron Starry Sky limited-edition watches, and the theme is hard to miss: each model pairs a black-coated titanium case and bracelet with a deep blue dial stamped in a spiral texture inspired by a swirling galaxy. It’s a sleek, modern look that leans into the Astron line’s tech-forward identity while still feeling distinctly “watch-first” in its finishing and details.
The release is split into two groups: radio-controlled Solar models and GPS Solar models. All four are built around lightweight titanium with a dark coating, and all come with fixed production caps, making these some of the more collectible Astron drops for anyone who prefers limited-run references.
Starting with the radio-controlled Solar pair, Seiko is introducing the SBXY105 and SBXY107. The SBXY105 comes in at 41.3 × 10.6 × 46.8 mm and uses Seiko’s 8B92 radio-sync Solar movement, designed for convenient time correction via radio signals while being powered by light. The SBXY107 is slightly smaller and slimmer at 39.6 × 9.5 × 45.4 mm, and it runs on the 7B72 radio-sync Solar caliber. Both radio-controlled editions are limited to 700 pieces each, with individual limited-edition numbering engraved on the caseback.
For buyers who want Seiko’s satellite-connected timekeeping, the GPS Solar models are the SSH187 and SSJ039. The SSH187 (also known as SBXC187 in Japan) is the larger, bolder option with a 43.3 × 13.4 × 49.5 mm titanium case and Seiko’s 5X83 GPS Solar caliber. The SSJ039 (SBXD039 in Japan) offers a more compact alternative at 41.2 × 12.0 × 48.6 mm and is powered by the 3X62 GPS Solar movement. These two GPS Solar watches are limited to 1,500 units each, and Seiko is reserving 500 units of each model specifically for the Japanese market.
While each reference has its own sizing and movement, the collection shares a consistent set of design cues: sharply faceted cases, integrated titanium bracelets, applied hour markers, and solid casebacks carrying Astron branding along with the limited-edition and movement markings. Dial layout differs between the two groups, too—date windows sit at 3 o’clock on the radio-controlled models, while the GPS Solar models place the date at 4:30.
At the time of the reveal, Seiko has not announced official pricing or specific regional release timing. For now, the key takeaways are clear: a galaxy-inspired dial treatment, black titanium construction, Solar-powered convenience, and strict production limits—an appealing combination for anyone tracking the latest Seiko Astron limited editions.
