Men’s Seiko Prospex GMT 1968 “Marine Green” SPB381J1 Automatic Watch

The Seiko Prospex GMT 1968 “Marine Green” (Model SPB381J1) is a professional-grade diver’s watch inspired by Seiko’s iconic 1968 heritage design. Featuring a 42 mm stainless steel case, a striking sunray green dial, and a matching green ceramic bezel, this timepiece combines rugged functionality with refined aesthetics. Powered by the in-house Calibre 6R54 automatic movement, it offers a GMT function, a 72-hour power reserve, and exceptional reliability. Built for adventure, it features a screw-down crown, sapphire crystal with anti-reflective coating, and 200-meter water resistance, making it an ideal companion for travel and underwater exploration.

Specifications:
Gender: Men’s
Movement Type: Automatic
Functions: Hours, minutes, seconds, date, and GMT (dual time display)
Caliber: 6R54
Movement Description: In-house automatic movement with manual winding capability, bi-directional winding system, 24 jewels, and approximately 72 hours of power reserve
Collection: Prospex
Subcollection: Save The Ocean – Marine Green
Dial Color: Sunray green
Hour Markers: Applied, luminescent, rimmed indexes
Hands: Luminescent hands with GMT hand
Specificities: Lumibrite, GMT function, stop-seconds function, fast date correction
Case Shape: Round
Material: Stainless steel with anti-scratch coating
Glass: Flat sapphire crystal with anti-reflective treatment
Case Back: Engraved screw-down stainless steel case back
Dimension: Ø 42.00 mm
Lug Distance: 20 mm
Lug-to-Lug: 48.5 mm
Thickness: 12.9 mm
Water Resistance: 200 meters
Case Specificities: Screw-down crown at 4 o’clock, engraved case back
Bezel: Unidirectional rotating dive bezel with 120 clicks
Bezel Material: Ceramic
Bezel Color: Green
Jewels: 24
Power Reserve: Approximately 72 hours
Bracelet: Stainless steel bracelet, brushed 3-row design
Bracelet Color: Steel
Clasp: Double folding deployant clasp with security mechanism
Country of Manufacture: Japan
Warranty: 3 Years
Launch Year: 2023
Manufacturer Reference #: SPB381J1