Seiko

Prospex "Save the Ocean" SPB317

Name: Seiko Prospex "Save the Ocean" SPB317 SPB317J1
Brand: Seiko
SKU: SPB317J1

Ref. SPB317J1

2022–present · 40.5mm · caliber Seiko Cal. 6R35 -- in-house automatic, 21,600bph, 70h PR, 24j; hand-wind and hacking; used across modern Prospex SPB line

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Movement tier: unclassified · caliber Seiko Cal. 6R35 -- in-house automatic, 21,600bph, 70h PR, 24j; hand-wind and hacking; used across modern Prospex SPB line

Medium-large: suits wrists 6.5 in+ (16.5 cm+)

40.5 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.

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Authentication

The "Save the Ocean" caseback engraving must be present; any SPB317 without it is either a non-genuine example or a misrepresented reference.

Known issues in the market

Caseback charity text is specific to the Save the Ocean edition; standard Prospex casebacks lack this engraving.
Shallow or inconsistent engraving depth indicates an aftermarket caseback or counterfeit.

Area	What to check	What is correct	Red flag
caseback	Save the Ocean engraving	Save the Ocean text engraved with consistent depth across all characters	Absent engraving or inconsistent depth around the text; aftermarket caseback or fake
dial	Blue ocean-themed dial coloring	Blue charity edition dial with ocean coloring matching Save the Ocean product documentation	Standard Prospex blue dial without the charity edition coloring; wrong reference

Common legitimate replacements