For the past three years, getting the green GMT Alpinist on your wrist meant one of two things: a flight to Tokyo or a gray-market premium that stung almost as much as the principle of the thing. Seiko sold the watch as the SBEJ005, a Japan exclusive, while the rest of the world made do with blue and black. Now the brand is finally righting that wrong with the HBC007.
The One That Got Away (Until Now)
When Seiko gave the Alpinist a mechanical GMT movement back in 2023, it was a legitimately big deal. The line had only ever offered dual-time functionality in quartz form, so a proper traveler’s Alpinist was long overdue.
And here’s where things got more annoying for us stateside residents. The blue SPB377 and black SPB379 launched worldwide, while the green dial, the colorway that made the Alpinist a cult hero through the SARB017 and the current SPB121, stayed locked in Japan. It always felt like a huge miss from Seiko and collectors said as much – loudly. The HBC007 feels like Seiko admitting that enthusiasts had it right here.
Same Green, Same Guts
Functionally, this is basically the SBEJ005 with a passport. That deep green dial returns with gilt cathedral hands and applied markers, plus a red-tipped 24-hour hand that plays off the bezel’s fixed 24-hour scale.
The case is classic modern Alpinist: 39.5mm across, 46.4mm lug-to-lug, and 13.6mm thick in super-hard-coated stainless steel. The signature rotating compass ring is still here too, operated via the second crown at 4 o’clock, a design cue that traces all the way back to the original 1959 Alpinist.
Inside beats the Caliber 6R54, Seiko’s automatic GMT movement with a 72-hour power reserve. Add 200 meters of water resistance and a screw-down crown, and this is a tool watch you can actually treat like one.
Here For Good
Best part? Unlike last year’s Asia-only SPB493, the HBC007 isn’t a limited edition. It’s joining the permanent Prospex lineup, paired with a dark brown LWG-certified leather strap that leans into the watch’s vintage field energy.
No edition numbers, no FOMO, no flippers. Just walk into a dealer this summer and buy one.
Spec Sheet
Case Size: 39.5mm
Lug-to-Lug: 46.4mm
Case Thickness: 13.6mm
Case Material: Stainless steel with super hard coating
Crystal: Curved sapphire with inner anti-reflective coating
Movement: Seiko Caliber 6R54 automatic GMT
Power Reserve: 72 hours
Water Resistance: 200m
Band: Dark brown leather (LWG-certified), three-fold clasp
Limited Edition?: No
Pricing & Availability
The HBC007 hits authorized retailers in July 2026 as a permanent member of the Prospex collection. UK pre-orders are already live at £1,100 (~$1,485), though Seiko’s US site hasn’t posted stateside pricing just yet.
Recap
Seiko Prospex Alpinist Mechanical GMT HBC007
After three years as a Japan-only exclusive, Seiko’s green-and-gold Alpinist GMT finally goes global this July with the 72-hour 6R54 inside. Better late than never.
