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Seiko Prospex Alpinist SPB121

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Where to buy Seiko Prospex Alpinist SPB121
Links open the retailer's current listings. Always check seller feedback, authenticity guarantees and return policy.

The Alpinist dates back to 1959, when Seiko built it for Japanese mountaineers. The SPB121 is the modern version: an emerald sunburst dial, gold-tone markers, an inner rotating compass ring and two crowns. At 39.5 mm with 200 m water resistance, it’s dressy enough for the office and tough enough for the trail.

Who it’s for

People who want a versatile, distinctive everyday watch with a story, and fans of green dials.

Buying tips

  • It replaced the much-loved SARB017. Collectors pay more for that discontinued reference. Track both if you’re undecided.
  • The 6R35 can run fast or slow out of the box. Ask about timekeeping on used pieces.
  • Black, white and limited dials (SPB117, SPB119 and others) share the case. Prices vary by dial.
Specifications
BrandSeiko
ReferenceSPB121
Case size39.5 mm
Case materialStainless steel
MovementAutomatic, Seiko 6R35
Power reserveAbout 70 hours
Water resistance200 m
CrystalSapphire
Production2020 – present
Typical market pricearound $750.00 (estimate; see tracked prices)

Seiko Prospex Alpinist SPB121 price history

Price tracking started. We record market prices for this watch every day. The chart appears once we have enough data points.

How we measure: eBay figures are the median of matching US listings after removing accessories, parts and statistical outliers. "Asking" means listed prices; "sold" means completed sales. Retailer prices are spot checks. Prices change constantly; confirm on the retailer's site.

Where to buy Seiko Prospex Alpinist SPB121
Links open the retailer's current listings. Always check seller feedback, authenticity guarantees and return policy.

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