Speedmaster Mods

Our Speedmaster-style chronograph Seiko mods are motorsport chronograph watches built around a Seiko VK63 meca-quartz chronograph movement (a hybrid, not a full automatic - we always say so), wearing the stepped tachymeter bezel and utilitarian moon-watch legibility. Every one carries a sapphire crystal and a 2-year warranty, and is splash-resistant as standard, with a Swim-Ready upgrade you can add at order time. Made to order, with free worldwide shipping. Made...

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  • Speedmaster (Black) Seiko VK63 meca-quartz chronograph mod watch. A black dial watch with a tachymeter bezel and a steel bracelet, shown in a full product shot.
    Sale

    Speedmaster (Black) | VK63 Custom Chrono Mod Watch

    Seiko Speedmaster Mod – Black
    $389.00 $518.67
  • Speedmaster (Blue) Seiko VK63 meca-quartz chronograph mod watch. A full watch shot showing a white dial with blue sub dials and a blue bezel on a blue rubber strap.
    Sale

    Speedmaster (Blue) | VK63 Custom Chrono Mod Watch

    Seiko Speedmaster Mod – Blue
    $389.00 $518.67
  • Speedmaster (Blue Panda) Seiko VK63 meca-quartz chronograph mod watch. A white dial watch with a tachymeter bezel and a rubber strap, shown in a full product shot.
    Sale

    Speedmaster (Blue Panda) | VK63 Custom Chrono Mod Watch

    Seiko Panda Speedmaster Mod
    $389.00 $518.67
  • Speedmaster (Midnight) Seiko VK63 meca-quartz chronograph mod watch. A black dial watch with a tachymeter bezel and a steel bracelet, shown in a full product shot.
    Sale

    Speedmaster (Midnight) | VK63 Custom Chrono Mod Watch

    Seiko Speedmaster Mod – Midnight
    $389.00 $518.67
  • Speedmaster (White) Seiko VK63 meca-quartz chronograph mod watch. A white dial watch with a tachymeter bezel and a steel bracelet, shown in a full product shot.
    Sale

    Speedmaster (White) | VK63 Custom Chrono Mod Watch

    Seiko Speedmaster Mod – White
    $389.00 $518.67
  • Speedmaster (Lunar White)
    Sale

    Speedmaster (Lunar White) | VK63 Custom Chrono Mod Watch

    Seiko Speedmaster Mod – Lunar White
    $389.00 $518.67

Our Speedmaster-style chronograph Seiko mods are motorsport chronograph watches built around a Seiko VK63 meca-quartz chronograph movement (a hybrid, not a full automatic - we always say so), wearing the stepped tachymeter bezel and utilitarian moon-watch legibility. Every one carries a sapphire crystal and a 2-year warranty, and is splash-resistant as standard, with a Swim-Ready upgrade you can add at order time. Made to order, with free worldwide shipping. Made to be looked at twice.

The racing chronograph, reimagined. The Seiko Speedmaster mod brings the tri-sub-dial motorsport dial to a dependable quartz chronograph movement and sapphire crystal.

Built to order with free worldwide shipping. Not a copy. A choice.

Which Seiko Speedmaster mod should you buy?

Short answer: all six Speedmaster-style builds run the same Seiko VK63 meca-quartz chronograph under sapphire crystal at the same price, so the only real choice is which dial you want. Meca-quartz means a battery keeps the time while the stopwatch runs on a mechanical module: the hand sweeps cleanly and snaps straight back to zero.

The Black is the classic tachymeter look, and White and Lunar White are the bright alternatives. Also in the range: Blue, Midnight and the Blue Panda.

Because it is meca-quartz, it is not an automatic and never needs winding. Read how meca-quartz compares with automatic chronographs in our chronograph guide. Every build is made to order and quality-checked before it ships, with free worldwide shipping and a 2-year warranty. A Swim-Ready (5 ATM) upgrade is available when you order.

Prefer a racing-style chronograph? Compare the Daytona-style Seiko mods.

Guides for this collection

Frequently asked questions

Is a Speedmaster mod a real watch?

Yes. Each one runs a Seiko VK63 meca-quartz chronograph movement (a hybrid, not a full automatic - we always say so). The chronograph module is mechanical while a battery keeps the time - we label it meca-quartz, never automatic.

Can I swim or dive with it?

Not as standard. Standard builds are splash-resistant: fine for rain, hand-washing and everyday wear, but not for swimming, showering or diving. To swim with it, add the Swim-Ready 5 ATM upgrade when you order, and screw the crown down before any water.

Is this an original watch?

Yes. Every watch is an original Rosevari build: a genuine Japanese movement in a case and dial style that pays homage to the classics. Every watch is sold openly as a Rosevari custom build, never as the genuine article, and we disclose every part we use.

How much does it cost and how long does it take?

All six Speedmaster-style builds start at the same price, and the Swim-Ready (5 ATM) upgrade is an optional extra. Every product page shows the current price in your local currency. Every build is made to order, in 1 to 2 weeks from order to dispatch, with free worldwide shipping and a 2-year warranty.