Seiko Astron GPS Solar SAST100 Kintaro Hattori Limited Edition


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Seiko Astron GPS Solar Kintaro Hattori Limited Edition SAST100


Seiko Astron GPS Solar
Caliber 7X52
GPS controlled time and time zone adjustment
Hour, minute and second hands
Date calendar
Perpetual calendar correct to February 2100
Signal reception result indication
World time function (39 Time Zones)
Daylight Saving Time function
Power saving function
Accuracy: +/-15 seconds per month
(without receiving a time signal and in temperatures between 5䋀 and 35䋀)
Case:High-intensity titanium with black hard coating with ceramic bezel
Case diameter: 47.0 mm, thickness: 16.5 mm
Band:Crocodile Leather with three-fold clasp with push button release (includes High-intensity titanium with black hard coating)
Glass: Sapphire crystal with Super-Clear Coating
Water resistance: 10 bar
Magnetic resistance: 4,800 A/m

Limited Edition: 5,000 pieces

Seiko Astron. The world’s first GPS solar watch.

The watch that understands time zones.

At last, the search for totally precise time, everywhere on the planet, is over. By developing our own, patented, low-energy-consumption GPS receiver, Seiko has been able to create a watch that can receive GPS signals and identify time zone, time and date data using the global network of GPS satellites. It recognizes all the 39 time zones on earth. This breakthrough timepiece is called Seiko Astron. Like its celebrated 1969 predecessor which was the world’s first quartz watch, the new Seiko Astron ushers in a new age of timekeeping technology. Seiko Astron will be released simultaneously in all markets of the world this autumn. Could this be the most intelligent watch ever built ?

Accurate time, anywhere on earth.

Once a day, Seiko Astron receives the time signal automatically and, on demand, connects to four or more of the GPS satellites that orbit the earth, thus pinpointing its position and identifying the time zone and the exact time. The hands adjust automatically to the correct local time with Atomic Clock precision. The new Seiko Astron is solar powered, so never needs a battery change, and it also has a perpetual calendar, so the date will always be as accurate as the time.

A complete collection, with innovation in every detail

Seiko Astron is not just a watch. It’s already a collection. In commemoration of the launch, a unique piece has been created and is offered in a limited edition of 2,500, with a high-intensity titanium case and ceramic bezel. The recessed sides of the case ensure that it is as light as it is robust. The case’s high-intensity titanium is stronger than stainless steel but has only 60% of its weight. It is accompanied by an additional extra-strength silicon strap that is four times stronger than any previous strap of this material.

There are three other models in high-intensity titanium and two in stainless steel. All have the same functions and high specifications, including a dual time sub-dial, in-flight mode indicator and sapphire crystal with Super-Clear Coating*.

The elegance and legibility of the dials disguise the richness of the information that can be displayed. In addition to the traditional date and dual time displays, the status of the GPS signal is indicated by the second hand and indicator at 10 o’clock position when the appropriate button is pressed. At a glance, you see whether a GPS signal has been received, and from how many satellites and whether Daylight Saving Time is activated.

The secret is in energy management

Why now and why Seiko? To combine Seiko’s solar technology with GPS required years of painstaking and ground-breaking R&D which has resulted in no less than 100 patent applications. Only Seiko’s advanced energy-efficiency technology could invent the miniature GPS receiver that requires so little energy to receive GPS signals from four or more satellites. Only Seiko’s unrivalled skills in micro-engineering could package this technology into a watch that is just 47 mm in diameter and weighs about 135 grams (with high intensity titanium case and bracelet). And only Seiko’s advanced IC circuitry expertise could make it possible for the watch to divide the world into one million ‘squares’ and allocate a time zone to each.

Convenient, simple and easy to wear.

Seiko Astron may be intelligent, but to wear it is a simple joy. If you step off a plane, just press the button and the time zone adjustment is automatic. It takes six seconds or a little more for the time to self-correct (to better than one second every 100,000 years!) and 30 seconds or a little more for the time zone, and the adjustment takes place whether you are stationary or on the move. So, if you can see the sky, you will know the time. The adjustment to or from Daylight Saving Time or Summer Time is also a one-touch operation, and the date is also always exact; Seiko Astron’s perpetual calendar is correct until February, 2100. The ease of use is further enhanced by Seiko’s solar technology which ensures that maintenance is never an issue. The watch takes power from all kinds of light and never needs a battery change.

Never before has time management been so simple. Wherever you travel, the new Seiko Astron will keep you on time. Effortlessly.

*sapphire crystal with Super-Clear Coating.
Our proprietary newly-developed anti-reflective coating, applied on both the front and back of the glass.
It prevents 99% of light reflection and allows the dial to be easily legible, even in bright light.


  • 5
    Amazing technology and beautiful

    Posted by Ray on 3rd Oct 2013

    I was worried if the solar power would keep this cutting edge watch charged up. It has only been a week but it hasn't budged off of the "Full" mark at all. I will definitely be looking to add other versions of this watch to my collection in the future. I love Seiko watches and this is one their best!

  • 5
    I really enjoy wearing this watch!

    Posted by Eddy on 3rd Oct 2013

    I used FedEx ground shipping and I got it within 3 day. Now I think of it, maybe I need to use's free shipping. I think I would still get it within 3 days. Enough about shipping. This was looks better than the picture they have on the website. If you ever looked at other Astron you know what I mean by the hour markers are not stickers on the face. They have depth to make them look 3-d.i also check the alignment of each hand by zeroing all of the hands to 12 O'clock and they all lined up correctly. The gold tone on this really make this watch look amazingly. The black face brings out the gold tone. I did change the band to polyurethane so that I can go into the water with this watch. The satellite receiver also works. Everything set by holding down button b. I do think the face is kinda small but it looks classy.