Seiko Prospex SPB377 Alpinist GMT Watch
Seiko Prospex SPB377 Alpinist GMT Watch
The first automatic Alpinist with a GMT complication, built on Seiko's 1959 mountaineering legacy.
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Editor’s Note
Seiko built its first Alpinist in 1959 specifically for Japanese mountain climbers, making it the brand's first sports watch, predating its dive watches by years. The SPB377J1 is the first automatic Alpinist to carry a GMT complication, built around the Cal. 6R54 with a 72-hour power reserve, enough for three days on the mountain without winding. The blue sunray dial carries the original's wedge-shaped markers, bold numerals, and stylized hands, with a red-tipped GMT hand tracking a second time zone against a 24-hour scale on the bezel, and LumiBrite hands and markers that stay readable before dawn on an alpine start. The inner rotating compass bezel is a functional navigation tool, usable with the sun to calculate bearings. The 39.5mm stainless steel case runs 13.6mm thick, fitting easily under a glove to protect hands in harsh conditions.
Details & Specs
- Reference: SPB377J1
- Movement: Caliber 6R54, automatic
- Power Reserve: 72 hours
- Case: 39.5mm diameter, 13.6mm thick, stainless steel
- Lug to Lug: 46.4mm
- Crystal: Domed sapphire with anti-reflective inner coating
- Dial: Blue sunray
- Water Resistance: 200 meters / 656 feet
- Bezel: Inner rotating compass bezel, 24-hour GMT scale
- Hands: LumiBrite, red-tipped GMT hand
- Strap: Leather
- Crown: Screw-down
- Case Back: Screw-down
- Weight: 150g
