Seiko Prospex Alpinist Automatic – SPB121
Seiko Prospex Alpinist Automatic – SPB121
Seiko Prospex Alpinist Automatic – SPB121

Seiko Prospex Alpinist Automatic – SPB121

SKU: 001-545-11978

Regular price $725.00

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The Seiko Prospex SPB121 targets life's adventurers and thrill-seekers, offering a contemporary take on Seiko's inaugural 1959 sport watch. This watch has a rotating inner compass bezel, making it an essential tool for outdoor exploration.

Its design is characterized by a sunray-finish green dial with gold accents, blending style with an outdoor aesthetic. LumiBrite hands and markers ensure legibility in low-light conditions, while a magnified date window adds practicality.

The watch features a sapphire crystal with anti-reflective coating for scratch resistance and clarity. Housing a 24-jewel automatic movement operating at 21,600 vibrations per hour, it offers an impressive 70-hour power reserve, with both manual and automatic winding options. Constructed from stainless steel and paired with a brown leather strap with a tri-fold clasp gives this piece a rugged yet sophisticated touch. With a water resistance rating of 200 meters, this timepiece is well-equipped for any adventure. The display case back lets enthusiasts admire the intricate mechanics inside.
Band Strap with Deployant Clasp
Band Color Brown
Band Material Leather
Caliber 6R35
Case Material Stainless Steel
Case Size 39.5mm
Case Thickness 13.2mm
Caseback Display
Clasp Three-fold
Collection Prospex
Collection 2 Alpinist
Crystal Sapphire Crystal
Dial Green
Function Date
Gender Men's
Lug-to-Lug 46.4mm
Movement Automatic
Power Reserve 70 Hours
Water Resistance 200m


Little Treasury Jewelers is the watch and jewelry store destination for the greater Baltimore-Annapolis area. Providing a piece for all of life’s occasions, offering a collection of wedding and engagement jewelry, fine timepieces, children’s jewelry, and gifts. With a selection of fine watches unequaled in the area, international jewelry designers, and a repair facility on the premise, Little Treasury is truly a “hidden gem” in Maryland.