Quarz Movement - 40mm - Steel caseback

Build your own Daytona-style custom chronograph with the MedoMods Seiko Mod Configurator. Choose your dial, tachymeter bezel, case finish and strap to design a one-off racing chronograph — powered by the Seiko VK63 mecha-quartz movement.

Discover the MedoMods Seiko Daytona Style Collection – custom-built Seiko mods that combine a classic Daytona-inspired racing look with the crisp feel of a Seiko VK63 mecha-quartz chronograph movement.

Every watch in this collection is hand-assembled to order. We use high-quality third-party aftermarket (non-OEM) parts, sapphire crystal, and premium stainless steel cases and bracelets to create a sharp, daily-wear ready Seiko mod built for everyday speed and style.

Choose your perfect Daytona-style Seiko mod:

Dials: Panda, Reverse Panda, Black, White, Ice Blue, Sunburst, Arabic variants and more

Sizes: 40 mm case option

Bezels: Tachymeter bezel options (classic, modern, ceramic-style looks)

Bracelets / Straps: Oyster-style bracelets, rubber straps, or leather options

Finishes: Steel, rose gold, two-tone, and bold dial colors

All watches are powered by the Seiko TMI VK63 mecha-quartz chronograph movement (battery-powered, with a crisp mechanical chronograph feel), regulated and quality-checked before shipping. Each piece is built as a unique custom Seiko mod watch, not a mass-produced factory model.

This collection features Seiko mod watches using OEM Seiko movements and third-party aftermarket parts.

If you are looking for a Seiko Daytona style mod, a VK63 chronograph mod, or a clean panda / reverse panda racing build, this collection is the best place to start.