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STOCK 2051 · SPB381J1

SEIKO Prospex Green Automatic GMT SPB381J1

1 100 €

Original retail price (2023): 1 700 € 600 € below the original retail price

Factory-new, never worn. Checked by hand in six steps.

Availability: 1 in stock

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  • Authenticity guaranteed
  • Secure checkout via Stripe
  • 14-day returns
  • Free worldwide shipping over 500 €

Delivery: insured, tracked shipping worldwide.

1,500+ watches sold on eBay, Catawiki and to private clients. Reviews

Condition and what’s included

Stock cardNO. 2051
Condition
New old stock: factory-new, never sold or worn.
Wear
NOS means unworn with no case wear. Every flaw is described.
Included
Listed for this watch in the description.
Checked
By hand, in six steps, before it was listed.
Returns
14 days. If a watch doesn’t match its description, we make it right.

No wear. No second owner. Just a watch exactly as it left the factory.

From our About page

Brand new Seiko Prospex GMT SPB381J1 featuring Seiko’s in-house Caliber 6R54 automatic movement with 72-hour power reserve. 42mm stainless steel case, sapphire crystal, and 200m water resistance. A professional-grade GMT built for travel and everyday wear.

The Seiko Prospex SPB381J1 Automatic GMT is part of Seiko’s professional-grade Prospex collection, designed for reliability in demanding environments.

Inspired by Seiko’s long-standing heritage in tool watches, this model combines robust construction with refined everyday wearability. The 42mm stainless steel case houses Seiko’s in-house automatic GMT movement, allowing tracking of a second time zone, ideal for travelers and professionals alike.

The deep green dial, paired with a matching rotating bezel, reflects the brand’s tradition of functional yet distinctive design. Lumibrite-coated hands and indices ensure strong legibility in low-light conditions, while the sapphire crystal enhances durability.

Powered by Seiko’s automatic Caliber 6R54 movement, the watch offers approximately 72 hours of power reserve and smooth mechanical performance.

With 200 meters of water resistance and a solid stainless steel bracelet, the SPB381J1 remains true to the Prospex philosophy: professional specifications without sacrificing everyday comfort.

Key Specifications:

  • Reference: SPB381J1

  • Movement: Automatic (Seiko Caliber 6R54, GMT function)

  • Case Size: 42mm

  • Case Material: Stainless Steel

  • Crystal: Sapphire

  • Water Resistance: 200m

  • Bracelet: Stainless Steel

  • Condition: Brand New

All watches are inspected prior to shipping.

Checked by hand in six steps.

Every watch is checked by hand before it is listed. This one went through all six. How we authenticate

  1. Physical inspection

    In hand, under magnification: case, lugs, crown and caseback.

  2. Dial and hands

    Under a loupe for printing, fonts, lacquer and originality.

  3. Movement

    Caseback opened where possible, calibre matched to the model.

  4. Reference

    Cross-checked against catalogues, collector databases and known-good examples.

  5. Condition grading

    NOS means unworn with no case wear. Every flaw is described.

  6. Documentation

    Case, dial, movement, clasp and what is included, all in the listing.

Before and after you buy

The quiet part of a good purchase.

Free worldwide shipping over 500 €

Insured, tracked shipping worldwide.

14-day returns

If a watch doesn’t match its description, we make it right.

Secure checkout via Stripe

Pay by card, Apple Pay or Google Pay.

Real people

We answer every question personally, before and after the sale. We’re real people and we reply fast.

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