Seiko Prospex SPB381J1 "Hulk" Green 1968 GMT Automatic Watch

Movement: Caliber Number 6R54
Movement Type: Automatic with manual winding
Precision: +25 to -15 seconds per day
Power reserve Approx. 72 hours(3 days)
Jewels 24
24-hour hand
Stop second hand function
Case Material: Stainless steel (super hard coating)
Case Size
Thickness:12.9mm
Diameter:42.0mm
Lug-to-lug:48.6mm
Sapphire crystal
Crystal Coating
Anti-reflective coating on inner surface
LumiBrite on hands, index(es) and bezel
Three-fold clasp with secure lock , push button release with extender
Distance between lugs: 20 mm
Other Details
Water Resistance: 200m / 660ft diver's
Magnetic Resistance: 4,800 A/m
Features
Unidirectional rotating bezel
Screw-down crown
Three-fold clasp with secure lock
Screw case back"