Seikonaut – Black Skeleton Mod with Rosegold Dial & Gray Strap (40mm)

This Seikonaut build pairs a deep black PVD case with elegant rosegold dial components and a muted gray rubber strap — a color palette that balances visual warmth with everyday versatility.

The watch runs on the Seiko NH72 skeleton movement, offering a fully exposed view of the gear train, balance wheel, and golden bridges beneath. Unlike a standard Seiko Nautilus open heart, which shows only part of the movement, this layout reveals everything — making the mechanics the center of the design.

Rosegold hands and markers offer rich contrast over the open dial, while the gray strap tones down the visual intensity, giving it a sleek, modern profile. Built around a 40mm case, this configuration fits seamlessly into any high-end Seiko mod watches build plan.

It’s a major aesthetic and functional upgrade over a classic Seiko dial — perfect for modders seeking that skeleton look with sharper edges and a more subdued finish.