Seiko Prospex SPB379 Alpinist GMT Black 3 Day Automatic BFD Strap has been previously sized

Strap has been previously sized

using an electro-magnetic braking system to control the unwinding of the mainspring

Model: Shell Star Automatic

* Bracelet: ballistic nylon strap

durable construction of the timepiece

Seiko Prospex SPB379 Alpinist GMT Black 3 Day Automatic BFD Strap has been previously sizedCaliber 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