Seiko has been nurturing the top of its Astron line lately, and the latest move leans into color. The brand just introduced a pair of limited editions built on the new Calibre 5X63, the references HAB005 and HAB006. Both arrive in bright, summery finishes that I wouldn’t normally expect on an Astron. They’re a little flashy for my taste, honestly, but I appreciate how much love this collection has been getting.
The Astron carries real weight in Seiko’s history. It descends directly from the 1969 original, the first quartz wristwatch ever sold, and the one that helped kick off the Quartz Crisis. Over the past couple of years, Seiko has reshaped that legacy into a luxury sports watch, with an angular case, an integrated bracelet, patterned dials, and GPS-linked accuracy. The May update brought the 5X63 movement, a thinner case, a cleaner dial layout, and a quick-release bracelet system. These two new models build on all of that.
Spec-wise, nothing changes from the 5X63 watches that launched last month. The Super Hard-Coated titanium case measures 43.4mm across, 50mm long, and 12.4mm thick, fitted to a matching three-row titanium bracelet. The movement covers a perpetual calendar that corrects for Daylight Saving Time, a dual-time function, a 1/20th-second chronograph, and a world timer. Light alone keeps it running for six months on a full charge. On its own the quartz is rated to +/-15 seconds per month, though the satellite-linking feature resets the hands to atomic time throughout the day, anywhere you happen to be.
What’s actually new is the dial. The symmetrical three-subdial panda layout stays, but the surface now carries a pressed, three-dimensional pattern inspired by the facets of a quartz crystal. It’s a fitting reference for a watch with this lineage, and it catches light in a way flat dials don’t. Seiko offers it in Crystal Pink and Crystal Green, each set against black subdials and accents. You can push the contrast further by swapping the bracelet for the included black silicone strap, which the push-button exchange system makes easy.
Both models are limited to 1,200 pieces and arrive in July 2026, which suits the summer styling. Pricing sits at $2,900 for each, matching the HAB004 145th Anniversary Edition from last month. Those three are the only 5X63 references that ship with an extra rubber strap, so there’s some added versatility built into the buy-in.
At $2,900 for a quartz watch, these will land differently depending on who you ask, and the colors push them into love-it-or-leave-it territory. Still, there’s something fitting about the descendant of the first quartz watch leaning this hard into a crystal motif. Whether the Astron’s recent run of attention keeps producing pieces this playful, or this turns out to be a one-off summer detour, is the part I’m curious to watch.
Co-Founder & Senior Editor
Michael Peñate is an American writer, photographer, and podcaster based in Seattle, Washington. His work typically focuses on the passage of time and the tools we use to connect with that very journey. From aviation to music and travel, his interests span a multitude of disciplines that often intersect with the world of watches – and the obsessive culture behind collecting them.