Popular Types of Seiko Mods: SKX, SPB, Turtle, Samurai, and Tuna

The most popular Seiko mod platforms explained—what they look like, why mod them, and which one fits your style.

Introduction

Seiko watches are the perfect canvas for customization. From the classic SKX to the premium SPB, the bold Turtle, the angular Samurai, and the legendary Tuna, each platform has its own character and parts ecosystem.

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Seiko SKX Mods

The SKX007/009 are the most modded Seikos ever—classic 42 mm diver case, huge parts availability, and endless looks.

Rexx SKX-style build with ceramic insert and sapphire crystal.

Seiko SPB Mods

SPB (e.g., SPB185) = vintage-inspired proportions with modern specs (sapphire, higher-grade finishing). Great for refined divers.

SPB reinterpretation with vintage dial and box sapphire.

Seiko Turtle Mods

Cushion case with wrist presence and comfort (SRP777 family). Bold look, great canvas for color dials and lume-heavy builds.

Turtle mod with cushion case and custom lume dial.

Seiko Samurai Mods

Angular case and sharp facets. Sporty, modern, and distinctive on the wrist—perfect for tool-watch vibes.

Samurai mod emphasizing the angular case geometry.

Seiko Tuna Mods

Iconic professional diver with a shrouded case (47–50 mm). Serious dive aesthetic, instantly recognizable and very customizable.

Tuna mod with shroud and high-contrast bezel.

Watch: Tools & Assembly in Action

Quick Comparison

Model	Case Size (approx.)	Style	Why Mod It?
SKX007/009	42 mm	Classic Diver	Largest parts ecosystem; ultimate flexibility
SPB185	~40.5 mm	Retro-Modern Diver	Premium base; refined finishes
Turtle	~45 mm	Cushion Diver	Comfort + vintage presence
Samurai	~43.8 mm	Angular Tool Diver	Distinct geometry; sporty
Tuna	47–50 mm	Pro Diver (Shrouded)	Iconic look; bold statement

Start Your Seiko Mod with Rexx

Pick your platform (SKX, SPB, Turtle, Samurai, Tuna) and we’ll build it to your specs—dial, bezel, crystal, hands, lume, and more.