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Seiko SSK GMT Mod — the affordable GMT donor

With the SSK series, Seiko brought a mechanical GMT movement (NH34) to the affordable Seiko 5 Sports line for the first time. The SSK003 with its blue-black bezel is nicknamed "Batman" in the community, the SSK001 comes in black. As a donor, the SSK is the cheapest base for real GMT builds with a second time zone.

Specifications

Case
Approx. 42.5 mm, 316L stainless steel
Movement
Seiko NH34 (GMT, caller)
Water resistance
100 m
Crystal
Hardlex (sapphire upgrade possible)
Variants
SSK001 black, SSK003 “Batman”, SSK005
Status
Current, available new

Why the Seiko 5 Sports GMT (SSK) as a donor?

  • Real mechanical GMT movement at an entry price.
  • Ideal base for Pepsi and Batman-style GMT builds.
  • Current and available new, no used-market risk.

Common builds

  • Pepsi GMT build with a blue-red insert
  • Batman-style GMT with a blue-black bezel

Matching models

Find finished mods on this base here:

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