Some watches tell time. The Seiko Rotocall SMGG21 tells a story that went to space. First introduced in 1982, the original Rotocall became an unofficial NASA favorite, strapped to the wrists of Space Shuttle astronauts who valued its ingenious rotating bezel over any government-issued chronometer. Seiko now revives that legacy in faithful, wearable form — and Lexor Miami is proud to offer it to collectors who appreciate horology with a genuine backstory.

At the heart of the SMGG21 is the octagonal rotary switch that made the original famous: simply turn the knurled bezel to cycle through functions — time, chronograph, dual-time, alarm, and countdown — then confirm with the two side pushers. It's tactile, intuitive, and unmistakably retro-futuristic, finished in a striking gray-and-blue colorway with a light gray dial that channels its 1980s spaceflight origins.

Powering the watch is Seiko's in-house Caliber A824 quartz movement, rated to ±20 seconds per month with roughly three years of battery life — precision engineered for a watch built to be worn, not babied. The 37mm stainless steel case keeps a compact, comfortable footprint on the wrist, while 100 meters (10 bar) of water resistance means this digital icon is equally at home poolside, on a dive boat, or in daily rotation. A five-link stainless steel bracelet with a secure three-fold push-button clasp comes standard, along with an included 20mm NATO-style nylon strap for effortless style changes.

Beyond its function, the Rotocall SMGG21 is a genuine piece of astronaut history reissued for a new generation of collectors — a conversation-starting alternative to the expected luxury diver or dress chronograph. Whether you're building a collection around space-flown references or simply want a watch with real provenance on your wrist, the SMGG21 delivers heritage, comfort, and collectability in equal measure.

Shop the Seiko Rotocall SMGG21 at Lexor Miami, your authorized Seiko destination for authentic, guaranteed timepieces — in-store in Miami or shipped nationwide.

Key Features 

• Flight-Proven Heritage — Reissue of the 1982 Seiko Rotocall worn by NASA Space Shuttle astronauts, giving your collection a genuine space-flown story
• One-Bezel Control — Rotate the octagonal bezel to instantly access chronograph, alarm, dual-time, and countdown functions — no fumbling through menus
• Precision Quartz Reliability — Caliber A824 movement keeps accuracy to ±20 seconds per month, so it's always ready when you are
• Three-Year Battery Life — Built-in battery life warning function means no surprise shutdowns and minimal maintenance
• 100m Water Resistance — Rated for swimming, diving prep, and daily wear without hesitation
• Comfortable, Compact Fit — 37mm case and 107g weight sit light on the wrist for all-day wear, unlike bulkier digital sport watches
• Split-Second Chronograph — Times up to 100 hours in 1/100-second increments for serious accuracy
• Two Straps, One Watch — Includes both the stainless steel bracelet and a 20mm NATO-style nylon strap for instant style versatility
• Durable Hardlex Crystal — Scratch-resistant protection built for real-world, everyday use
• Secure Three-Fold Clasp — Push-button release keeps the bracelet locked in place during active wear
• Instant Collector Recognition — A rare case of a modern reissue priced below its vintage original, making it accessible entry into space-watch collecting
• Authorized Seiko Retailer — Purchased through Lexor Miami, backed by manufacturer warranty and authenticity guarantee

Specifications