SEIKO Astron SBXC153 Solar-Powered Watch

The SBXC153 is equipped with the newly developed Caliber 5X83, a next-generation GPS Solar movement that combines advanced functionality with high-speed performance. In addition to a dual time display, the new caliber introduces a 1/20-second chronograph, offering enhanced versatility for global travelers and professionals.

The sub-dial at 12 o’clock measures 1/20-second stopwatch timing, while the 6 o’clock sub-dial normally displays a second time zone and automatically switches to a chronograph hour/minute totalizer during stopwatch operation. At 9 o’clock, a multi-indicator hand displays multiple statuses, including day of the week, airplane mode (GPS reception ON/OFF), power reserve, and chronograph mode—allowing clear, intuitive operation at a glance.

Compared with previous models, Caliber 5X83 significantly reduces the time required for Time Transfer, the function that instantly swaps the home time and second time zone with a simple button press. Improved charging efficiency also enables the use of a high-contrast, premium dial, enhancing both legibility and luxury appeal.

The regular model features a contrast-colored dial, differentiating the base dial from the sub-dials for a dynamic, modern look. A dual-material bezel made of ceramic and titanium, engraved with Arabic numerals and the word “CHRONOGRAPH,” reinforces the watch’s sporty character. The low center-of-gravity titanium case ensures excellent comfort on the wrist, while the dual-curved sapphire crystal with Super Clear Coating delivers outstanding visibility from every angle.

Movement & Functions

Caliber No.: 5X83
Movement Type: GPS Solar (satellite time synchronization)
Accuracy: Average ±15 seconds per month (approx. ±1 second per day equivalent)
Jewels: 14

Power Reserve:

• Approx. 6 months on full charge

• Approx. 2 years in power-save mode

Functions

• Overcharge prevention

• Power save function

• Stopwatch (1/20-second, up to 12 hours)

• Perpetual calendar (until February 28, 2100)

• World Time (38 time zones)

• Dual time display

• Day-of-week display

• Power reserve indicator

• Time Transfer function

• GPS satellite time zone adjustment

• Super Smart Sensor

• Satellite acquisition count display

• Reception result display

• DST (daylight saving time) function

• Reception OFF function (airplane mode)

• Automatic hand position correction

Case & Band

Case Material: Pure titanium
Bezel: Ceramic and pure titanium
Case Coating: DiaShield
Case Size:

• Thickness: 13.4 mm

• Width: 43.3 mm

• Length: 49.5 mm

Crystal: Dual-curved sapphire crystal
Crystal Coating: Super Clear Coating
Luminous Material: LumiBrite (hands and indexes)

Clasp: One-push three-fold clasp
Weight: 117 g

Watch Specifications

• Water resistance: 10 bar (100 meters)

• Magnetic resistance: Yes

• Screw case back

• Smart Adjuster clasp mechanism

• Metal allergy resistant