[New product in April 2026] Seiko Astron HAC002J｜Navy x pure titanium x Cal.7B62 5-station radio solar, diamond shield x smart adjuster for everyday use NEXTER

Featured models to be released in April 2026 in Seiko Astron's new line "NEXTER"HAC002Jhas appeared.
Astron is famous for its top line of GPS radio solar, but NEXTER is a series aimed at a new generation of users with its practical design that supports 5 stations using terrestrial radio solar, and its easy-to-handle size and price range. Among them, HAC002J is a model with a navy dial, and is characterized by a firm and intelligent expression.

Equipped with Cal.7B62, which supports standard radio waves from 5 stations in Japan, China, the United States, Germany, and the United Kingdom, the material composition of pure titanium (diamond shield) and sapphire glass (super clear coating) is a full-fledged specification typical of Astron. The case size is 42mm long x 36mm wide x 9mm thick, and has just the right amount of volume to suit everyone from business to casual wear. When you put the pure titanium watch, which weighs approximately 71g, on your wrist, you will be surprised at how light it is.

Astron NEXTER series——The lightweight feel of pure titanium and the high-quality appearance typical of Astron.

Wearing HAC002J - Approximately 71g of pure titanium fits comfortably on your wrist, making NEXTER comfortable to wear.

Navy dial x titanium diamond shield - the deep color gives an intellectual look to your hands.

Nakadome with smart adjuster mechanism - A powerful tool that allows you to quickly and easily adjust changes around your arm.

■ Main features

• Equipped with Cal.7B62 (solar radio wave):Compatible with standard radio waves from 5 stations: Japan, China, America, Germany, and the UK. Equipped with automatic reception, forced reception, reception result display, and automatic needle position correction functions.
• Approximately 9 months operation when fully charged:Designed for a long life of approximately 2 years when power save is activated. Reliable photovoltaic power that keeps charging as long as there is light
• Pure titanium (Diamond Shield):Lightweight and skin-friendly pure titanium case and band with diamond shield coating for high scratch resistance.
• Metal allergy resistant:Selection of materials that can be worn with confidence even by those concerned about metal allergies
• Navy dial:The deep and calming navy color blends into both intellectual business settings and casual outfits.
• Sapphire glass (super clear coating):High-quality glass that is resistant to scratches and minimizes reflections
• Nakadome with smart adjuster mechanism (one-push three-fold method):A mechanism that allows you to quickly fine-tune the band length without tools. Compatible with daily changes in arm circumference
• Fully automatic calendar (until December 31, 2099):Automatically adjust the number of days and leap years for each month
• Time difference correction function:Supports time switching when traveling overseas
• Overcharge prevention function, immediate start function, power save function:Fully equipped with practical functions that support long-term stable operation
• Water resistant to 10 ATM/class 1 magnetic resistance:Both enhanced waterproofing and magnetic resistance for everyday use

■Specs

■ “A new chapter of radio solar Astron” called Astron NEXTER

In the Seiko Astron lineup, NEXTER is a series with a different approach from the top model of GPS radio solar. It uses a solar radio system that receives radio waves from standard radio stations (5 stations) on the ground and automatically adjusts the time to an accurate time, making Astron's philosophy of "accurate and hassle-free" more accessible.

Cal.7B62 installed in HAC002J covers 5 stations: Japan (JJY), China (BPC), America (WWVB), Germany (DCF77), and England (MSF). The long-life design, which lasts about 9 months when fully charged, and the outstanding durability of about 2 years when using power save, creates a sense of security that says, ``Even if you forget you're wearing it, there's no problem.''

■ “Both lightness and strength”: pure titanium x diamond shield

The case and band of the HAC002J are made of pure titanium, which is lighter than regular stainless steel, puts less strain on the body, and is known as a material that is less likely to cause metal allergies. Astron chose pure titanium because we emphasized its suitability as a tool watch that is worn for long periods of time.

Diamond Shield coating is Seiko's unique surface hardening technology that compensates for the flaw in the titanium surface, which is easily scratched. As a main watch that you use every day, the reliability of maintaining its beautiful condition over a long period of time is the reason why you choose it as your everyday watch.

■ Smart adjuster x navy—designed for business people

The clasp with smart adjuster mechanism allows you to fine-tune the length of the band without using tools. Combined with the ease of putting on and taking off with the one-push, three-fold method, it allows for a smooth transition from getting ready in the morning to business situations. A design that can quickly respond to slight changes in the circumference of your wrist depending on the season or your physical condition is important for comfort in a watch that you wear every day.

The navy dial has a calm presence that does not overstate it even in business situations, and the contrast with the suit gives it a sophisticated impression. If you compare it with the related model HAC001J (silver/white type), you can clearly see that although they have the same NEXTER design, they have completely different atmospheres.

■ Recommended for these people

• Those who were looking for Seiko Astron NEXTER series
• Those looking for a business watch with navy dial x pure titanium x 5 radio solar stations
• Those who are considering comparing HAC001J and color
• Those looking for a watch made of metal allergy resistant material
• Those who want to use a highly scratch-resistant model with diamond shield coating for a long time
• Those who are looking for a band that can be easily adjusted with a smart adjuster.
• People who want to give Astron as a present for a promotion, birthday, or anniversary

■ Buyer's comment

When I picked up HAC002J, I was surprised at how light it was made of pure titanium. At approximately 71g, it feels lighter than the number suggests, and you can wear it on the cuff of your suit without any stress at all. The navy dial looks deeper and more beautiful in real life than in the photo, and it has a presence that often makes people ask, "What's that?" when I wear it in a business setting. The time is always accurate with the 5-station radio solar control, and the smart adjuster makes it easy to adjust.This is a NEXTER that has made Astron's ``high precision that does not require much effort'', which has been honed over many years, easy for anyone to pick up.

— Nanapure Buyer Fujimuro

■ Purchase at each mall

■ Related model (ASTRON NEXTER)

• Astron See list
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