Seiko Prospex Alpinist 39.5 MM Automatic GMT Black Dial Watch SPB379J1

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 (dual time display function)

Stop seconds hand function

Case Material: Stainless steel (super hard coating)

Case Size

Thickness:13.6mm

Diameter:39.5mm

Lug-to-lug:46.4mm

Crystal: Curved sapphire crystal

Crystal Coating: Anti-reflective coating on inner surface

LumiBrite: LumiBrite on hands and index(es)

Band Material: Cow Steer

Clasp: Three-fold clasp with push button release

Distance between lugs: 20

Water Resistance: 20 bar

Magnetic Resistance: 4,800 A/m

Screw-down crown

See-through & Screw case back