Front View Seiko Watches Prospex Alpinist GMT SPB377
A Seiko Luxe Watches Prospex Alpinist GMT SPB377 wristwatch with a blue leather strap and a dark dial is placed on a brown leather bag featuring visible stitching and a zipper.
A person in a blue denim jacket holds a camera, wearing the Seiko Luxe Watches Prospex Alpinist GMT SPB377—a mechanical sports watch—with a silver case, blue face, and matching blue leather strap.
A Seiko Luxe Watches Prospex Alpinist GMT SPB377 features a blue dial, silver bezel, black leather strap, and two crowns, displayed resting on a light wooden surface. This mechanical sports watch shows the time, date, and includes a GMT hand.
The Seiko Luxe Watches Prospex Alpinist GMT SPB377 features a transparent case back that showcases its automatic movement, labeled with Seiko and Twenty-Four Jewels. This distinctive mechanical sports watch is paired with a leather strap that has a tan interior and elegant navy edges.
Seiko Luxe Watches Prospex Alpinist GMT SPB377 with a blue leather strap, shown from the back to highlight its transparent case and visible automatic movement with gold-tone rotor—an exceptional mechanical sports watch.
A side view of the Seiko Watches Prospex Alpinist GMT SPB377 by Seiko Luxe Watches, featuring a silver case, two push buttons, and a blue leather strap with tan underside, displayed on a light purple background.
A Seiko Watches Prospex Alpinist GMT SPB377 by Seiko Luxe Watches is displayed beside a Google profile for Lexor Miami, a retailer offering sunglasses, watches, and perfumes. The store features a 5-star rating along with photos showcasing its interior.
Front View Seiko Watches Prospex Alpinist GMT SPB377 A Seiko Luxe Watches Prospex Alpinist GMT SPB377 wristwatch with a blue leather strap and a dark dial is placed on a brown leather bag featuring visible stitching and a zipper. A person in a blue denim jacket holds a camera, wearing the Seiko Luxe Watches Prospex Alpinist GMT SPB377—a mechanical sports watch—with a silver case, blue face, and matching blue leather strap. A Seiko Luxe Watches Prospex Alpinist GMT SPB377 features a blue dial, silver bezel, black leather strap, and two crowns, displayed resting on a light wooden surface. This mechanical sports watch shows the time, date, and includes a GMT hand. The Seiko Luxe Watches Prospex Alpinist GMT SPB377 features a transparent case back that showcases its automatic movement, labeled with Seiko and Twenty-Four Jewels. This distinctive mechanical sports watch is paired with a leather strap that has a tan interior and elegant navy edges. Seiko Luxe Watches Prospex Alpinist GMT SPB377 with a blue leather strap, shown from the back to highlight its transparent case and visible automatic movement with gold-tone rotor—an exceptional mechanical sports watch. A side view of the Seiko Watches Prospex Alpinist GMT SPB377 by Seiko Luxe Watches, featuring a silver case, two push buttons, and a blue leather strap with tan underside, displayed on a light purple background. A Seiko Watches Prospex Alpinist GMT SPB377 by Seiko Luxe Watches is displayed beside a Google profile for Lexor Miami, a retailer offering sunglasses, watches, and perfumes. The store features a 5-star rating along with photos showcasing its interior.

Seiko Watches Prospex Alpinist GMT SPB377

SKU: SPB377

$1,150.00

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Seiko Watches Prospex Alpinist GMT SPB377

 The Seiko Prospex Alpinist GMT SPB377 brings one of Seiko’s most distinctive adventure-watch designs into a versatile mechanical GMT built for modern travelers, collectors, and everyday explorers. Rooted in the heritage of the original 1959 Laurel Alpinist, the contemporary Alpinist has evolved from a rugged mountain companion into a refined sports watch designed to transition effortlessly from the outdoors to the city.

At the heart of the SPB377 is Seiko’s Caliber 6R54 automatic GMT movement, featuring both automatic and manual winding, a 24-hour hand for dual-time display, stop-seconds functionality, and an impressive approximately 72-hour power reserve. The red-tipped GMT hand and 24-hour display provide clear second-time-zone tracking, making this Seiko GMT watch particularly useful for international travel and frequent flyers.

Its 39.5mm stainless steel case offers a balanced presence on the wrist, while the 46.4mm lug-to-lug measurement helps maintain a wearable profile. A curved sapphire crystal with inner anti-reflective coating provides excellent clarity and scratch resistance, while LumiBrite on the hands and indexes enhances legibility in low-light conditions. The signature rotating compass inner ring adds the distinctive Alpinist character that collectors have come to recognize.

Built for adventure, the SPB377 offers 200 meters (20 bar) of water resistance, a screw-down crown, magnetic resistance of 4,800 A/m, and a super-hard-coated stainless steel case. Its cow-leather strap and three-fold clasp with push-button release balance rugged functionality with everyday comfort.

For collectors seeking a sophisticated Seiko automatic GMT watch, the SPB377 delivers an exceptional combination of Japanese watchmaking heritage, practical travel functionality, mechanical performance, and unmistakable Alpinist design. Discover the Seiko Prospex Alpinist GMT SPB377 at Lexor Miami and add a distinctive adventure-inspired timepiece to your collection.

Key Features

  • Seiko Prospex Alpinist GMT — distinctive adventure-inspired design descended from the legendary Alpinist lineage.
  • Caliber 6R54 Automatic GMT Movement — mechanical movement with automatic and manual winding capability.
  • 72-Hour Power Reserve — approximately three full days of running autonomy when fully wound.
  • Dual-Time GMT Function — dedicated 24-hour hand allows convenient tracking of a second time zone.
  • 39.5mm Stainless Steel Case — versatile case diameter designed for a balanced everyday wrist presence.
  • Curved Sapphire Crystal — durable sapphire crystal with inner anti-reflective coating for enhanced clarity.
  • Signature Compass Inner Ring — rotating internal compass bezel reinforces the Alpinist's exploration-focused identity.
  • 200m Water Resistance — 20 bar water resistance for confident everyday wear and aquatic activities; this is a Land model rather than a dedicated professional diver.
  • LumiBrite Illumination — luminous hands and indexes improve readability in low-light conditions.
  • Super-Hard-Coated Stainless Steel — enhanced case durability for an adventure-ready everyday watch.
  • Leather Strap & Push-Button Clasp — cow-leather strap paired with a three-fold clasp for a refined, secure fit.
  • Collector-Friendly Alpinist Design — combines Seiko heritage, mechanical GMT functionality, and a highly recognizable sports-watch aesthetic.

Technical Specifications

Specification Details
Brand Seiko
Collection Prospex
Series Alpinist
Model SPB377
Reference SPB377J1
Watch Type Mechanical GMT
Movement Seiko Caliber 6R54
Movement Type Automatic with manual winding
Jewels 24
Power Reserve Approx. 72 hours / 3 days
Accuracy +25 / -15 seconds per day
Functions GMT / dual-time display, stop seconds
Case Material Stainless steel with super-hard coating
Case Diameter 39.5mm
Case Thickness 13.6mm
Lug-to-Lug 46.4mm
Lug Width 20mm
Crystal Curved sapphire
Crystal Coating Anti-reflective coating on inner surface
Water Resistance 20 bar / 200m
Magnetic Resistance 4,800 A/m
Luminous Material LumiBrite on hands and indexes
Crown Screw-down
Inner Bezel Rotating compass ring
Caseback See-through, screw case back
Strap Cow leather
Clasp Three-fold clasp with push-button release
MSRP $1,150 USD


Own the Seiko Prospex Alpinist GMT SPB377

Bring Japanese mechanical watchmaking, Alpinist heritage, and practical GMT functionality to your collection. The Seiko Prospex Alpinist GMT SPB377 combines a 72-hour automatic movement, sapphire crystal, 200m water resistance, and distinctive adventure-inspired design in one exceptionally versatile timepiece.

Shop the Seiko SPB377 at Lexor Miami today and elevate your everyday watch collection with a true Prospex GMT.

 


    At Lexor Miami, we want you to love your purchase. If for any reason you're not satisfied, you may return any unopened and unused merchandise in its original condition and packaging within 30 days of delivery.

    • Return Eligibility
    - Items must be unopened, unused, and in original condition and packaging.
    - Gift With Purchase must also be returned in original condition to qualify for a full refund.
    - Testers (if purchased) are non-returnable.
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    • Exchanges & Defective Items
    If your order arrives damaged, defective, or incorrect, we’ll make it right. You may choose:
    - A full refund to your original payment method, or
    - A replacement of the same item (if in stock)

    Please notify us within three (3) business days of receiving your order.
    Email us at Info@LexorMiami.com before sending anything back.

    • Return Process
    1. Contact us first at Info@LexorMiami.com to request an RA (Return Authorization).
    2. Once approved, we’ll email you a prepaid return shipping label—at no cost to you.
    3. Include your packing slip or proof of purchase in the return package.

    Returns without RA may be delayed or not accepted.

    • Return Address:
    Lexor Miami
    2371 NW 20th St
    Miami, FL 33142
    United States

    • Shipping Your Return
    - For approved returns, we provide a prepaid return shipping label. Free Return.
    - For items over $75, we recommend using a trackable shipping service or purchasing shipping insurance, especially if not using our prepaid label.

    Shipping To return your product, you should mail your product to: 2371 NW 20th St, Miami, FL 33142, United States, Miami FL 33142, United States

    You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.

    Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

    If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.

    Gift with purchase needs to be returned in original condition with the purchased product.

     

    Free Shipping Policy

    Free shipping only applies to individual products priced at $150 or more.
    Products priced under $150 do not qualify for free shipping and standard shipping and handling fees will apply.

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    https://www.lexormiami.com/ I does not ship DOT-restricted items to Alaska, Hawaii, Puerto Rico, APO/FPO/DPO or International addresses. Also only ship 48 contiguous states, We don’t Ship Apo, Hawaii and Alaska.  Because we are only shipping through ground shipping contiguous states.