The Seiko Alpinist GMT HBC007 is not a new watch. It is the green SBEJ005 that Japan has had to itself since 2023. The news is that the rest of us can now buy it officially.
When Seiko gave the Alpinist a mechanical GMT in 2023, it split the line by country. Outside Japan you could buy the blue SPB377 and the black SPB379. The green one, the SBEJ005, went on sale in Japan on 7 October 2023, and only through Seiko’s Global Brand Core Shops.
That was an odd choice. Green with gold-tone details is the colourway most people picture when they hear the word Alpinist. So the SBEJ005 became the one people imported through grey-market sellers. People had been asking for a green GMT since the line launched.
Now it has an international reference. Seiko lists the Seiko Alpinist GMT HBC007 as a regular Prospex model, not a limited edition. It was revealed in June 2026 and reached stores from July .
What the Seiko Alpinist GMT HBC007 is
It is the Alpinist look you already know, with a working GMT added.
The dial is a green sunburst with gold-tone hands and applied markers. The date sits between 4 and 5 o’clock. Around the dial is the internal compass ring, the Alpinist signature, which you turn with the crown at 4 o’clock. Outside that sits a 24-hour scale on the bezel, and a central GMT hand with a red tip reads against it.
Inside is Seiko’s Caliber 6R54. It is an automatic that you can also wind by hand, and the seconds hand stops when you pull the crown to set the time. Seiko quotes about 72 hours of power reserve and an accuracy of +25 to −15 seconds a day.
The GMT hand is the one you set on its own. In practice that means you leave local time alone and use the red hand to track a second time zone, home for example, while you travel or work across time zones.
The case of the Seiko Alpinist GMT HBC007 is 39.5mm wide, 13.6mm thick and 46.4mm from lug to lug, with 20mm lugs. It has a curved sapphire crystal, a see-through caseback and 200m of water resistance.
What changed from the blue and black GMTs
Very little, and that is the point.
The case, the dimensions, the movement and the water resistance are the same as the SPB377 and SPB379. Within the GMT line, the green is not thicker or bigger than its siblings.
Two things are different:
- The dial. Green with gold-tone hands and markers, where the blue and black use silver-tone details. Visually, that is the whole story.
- The strap. A dark brown leather strap, reported as certified by the Leather Working Group .
The price is the same too. On Seiko’s own sites the HBC007, the SPB377 and the SPB379 all sit at A$1,800 in Australia and US$1,150 in the US. You are not paying extra for the colour that used to be hard to get.
Against the standard Alpinist
The other comparison worth making is with the time-only green Alpinist, the SPB121.
The GMT adds the 24-hour bezel and the red GMT hand. That gives it a busier, more tool-like dial. The time-only watch is cleaner to read at a glance. The GMT tells you more.
The GMT module also adds a little height. The Seiko Alpinist GMT HBC007 measures 13.6mm against about 13.2mm for the SPB121 . Less than half a millimetre is unlikely to matter much on the wrist, but it is there.
What we know about the blue and black in Japan
There is a twist. On 11 September 2026, Seiko released a blue HBC008 and a black HBC009 in Japan, through the same core shops that used to keep the green one to themselves.
It is easy to read this as the same pattern in reverse. Japan got the green first, the world got it later, so maybe the world gets these later too. But that is a guess. Seiko has not said anything about selling the HBC008 or HBC009 outside Japan.
The Specs
The Basics
- Reference: HBC007 (HBC007J1). Japanese equivalent: SBEJ005
- Case: Stainless steel with Seiko’s super hard coating, 39.5mm x 13.6mm, 46.4mm lug to lug
- Lug width: 20mm
- Dial: Green sunburst, gold-tone hands and applied markers, date between 4 and 5 o’clock
- Bezel: 24-hour scale, plus an internal compass ring turned by the crown at 4 o’clock
- Lume: LumiBrite on hands and markers
- Crystal: Curved sapphire, anti-reflective coating on the inner surface
- Caseback: See-through, screw-down
- Crown: Screw-down
- Water resistance: 200m (20 bar)
- Magnetic resistance: 4,800 A/m
- Strap: Dark brown cow leather, three-fold clasp with push-button release
- Edition: Regular collection, not limited
The Movement
- Calibre: Seiko 6R54
- Functions: Hours, minutes, seconds, 24-hour GMT hand, date
- Winding: Automatic, with hand-winding and hacking seconds
- Frequency: 21,600 vph (3Hz)
- Jewels: 24
- Power reserve: About 72 hours
- Accuracy: +25 to −15 seconds a day
Pricing & Availability
- Australia: A$1,800 (Seiko Australia)
- United States: US$1,150 (Seiko USA)
- Japan: ¥155,100 including tax, sold as the SBEJ005
The Seiko Alpinist GMT HBC007 is part of the regular Prospex collection, so there is no production limit. At the time of writing, Seiko’s online boutique in Australia was showing it as not in stock, with a “notify me” option.
Where to buy: Seiko lists the HBC007 on its Australian online boutique, and its authorised stores in its store finders for Australia and the United States. The global product page links to other countries.
More new releases are in our watch news.
