Seiko Prospex SPB379 Alpinist GMT Black 3 Day Automatic

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

Case Material: Stainless steel (super hard coating)

Case Thickness:13.6mm

Case 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

Features: Screw-down crown, See-through & Screw case back

Functions: 24-hour hand, Stop seconds hand function