Seiko Prospex Alpinist Mechanical GMT Blue SPB377 SPB377J1

Taking its name from the original and much-loved Seiko ‘Alpinist’ – launched in 1959 for Japanese ‘Yama-otoko’ mountain men, reliable in treacherous terrain – this watch further evolves the Alpinist specifications and overall design – with a legibility focus.

Its Arabic numerals are a signature feature of Alpinist pieces, whilst the curved sapphire glass, 24-hour display on the bezel and red 24-hour hand enhance the legibility further.

Ever practical, the watch features a compass functionality, whilst its super-hard coating gives it shine and strong scratch resistance. The in-house built 6R54 Calibre is the first mechanical GMT movement in a Prospex watch to have a three-day power reserve, allowing tracking of two different time zones at the same time.

Prospex is a combination of the words ‘Professional’ and ‘Specifications.’ Seiko Prospex timepieces are designed to be practical, reliable and durable; to meet the high standards required in extreme environments for sports lovers and adventure seekers alike.

Movement:

Accuracy:-15/+25 seconds per day
Calibre:6R54
Movement Type:Automatic with Manual Winding
Power Reserve:72 Hours
Jewels:24

Exterior:

Dial Colour:Blue
LumiBrite:Lumibrite on hands and indexes
Case Material:Stainless steel (Super Hard Coating)
Strap/Bracelet:Calfskin
Clasp:Three-fold clasp with push button release
Case Diameter:39.5mm
Case Thickness:13.6mm
Case Length:46.4mm
Lug Width:20.0mm

Other Specs:

Water Resistance:20 bar
Crystal Coating:Anti-reflective coating on inner surface
Crystal Type:Curved Sapphire Crystal
Other Specifications:Screw-down crown, See-through case back
Watch Function:Stop seconds hand function, GMT
Magnetic Resistance:4,800 A/m