How much does a 62MAS inspired Seiko mod cost?

The default build is a few hundred dollars before shipping and taxes. The page labels the discontinued SPB143 comparison as historical, while the mod total updates with catalog pricing. It is a mod build using aftermarket parts inspired by the design.

What is a 62MAS and why is it a popular mod target?

The 62MAS is Seiko's first purpose-built dive watch from 1965. Its plain sunburst dial, black rotating timing bezel, and crown-guard-free case make it a common vintage-diver look in the mod community.

Does this build use a date?

Yes. The curated grey dial has a standard 3 o'clock date window, paired with the NH35 movement's date display.

How hard is a 62MAS-inspired build?

Beginner. It uses the same widely available SKX007/SRPD-compatible parts system as most first builds, with a smaller case and no crown guard to work around.

Inspired build

Build a Seiko 62MAS inspired Seiko mod

TL;DR

Build a Seiko 62MAS (SPB143) inspired Seiko mod from curated, compatible parts. The default build is $416 before shipping or taxes. It is inspired by the look, not a replica of the watch.

Open the default build See the full build guide Read the beginner guide Check the glossary

This is a Seiko 62MAS inspired build. A compact diver case, a grey sunburst dial, vintage-style cathedral hands, and a black 62MAS-style timing bezel bring back the look of Seiko's original 1965 diver.

The 62MAS is prized for its simplicity: a clean sunburst dial, no crown guard, and a case that wears smaller than most modern divers. This build keeps that restraint using 62MAS-specific mod parts.

Updated 3 August 2026·Assemble Watches Editorial

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Your build

$416

Beginner · prices in USD

Build

Your build

$416

Beginner · updates as you choose

Reference watch

~$1,400

Seiko 62MAS (SPB143)

Official reference ↗

Historical US retail comparison for the discontinued SPB143.

Prices are shown in USD and may change at the supplier.

How this differs from the real watch

The SPB143 uses Seiko's 6R35 movement with a 70-hour power reserve and a sapphire crystal. This build uses an NH35 with roughly a 41-hour reserve and an acrylic-style crystal look.
The real 62MAS reissue is built to 200m water resistance with Seiko's own case sealing. Treat an aftermarket mod as a display build unless you have it pressure tested.
Seiko's own vintage-inspired case finishing and bracelet taper are proprietary. The compatible oyster bracelet here matches the vintage silhouette, not the exact link engineering.

Build this yourself

Dial

The grey sunburst dial keeps the clean vintage face the 62MAS is known for, with a standard 3 o'clock date window matched to the NH35.

Movement

The NH35 is the practical automatic choice, and its standard 3 o'clock date matches the selected dial.

Hands

Vintage patina cathedral hands give the aged-lume look collectors associate with the original 62MAS; polished silver is a cleaner modern read.

Case

This case has the compact, no-crown-guard 62MAS silhouette, sized for the SKX007/SRPD/62MAS parts family.

Bezel ring

The polished coin-edge bezel gives the insert a secure, period-appropriate frame.

Bezel insert

The black ceramic 62MAS-style insert restores the original watch's rotating elapsed-time scale.

Chapter ring

A plain brushed steel chapter ring suits the 62MAS's understated vintage face; black is the alternate for a more modern contrast.

Crown

This case needs a separate crown; a polished big crown keeps the vintage proportions.

Strap or bracelet

This 62MAS-specific brushed oyster bracelet is shaped for the case's lug width and taper. A black NATO or brown leather strap is the common casual alternative.

Bracelets

Straps

Open this exact build in the full builder to check fit and find suppliers →See the full build guide for this exact selection →

Common questions

How much does a 62MAS inspired Seiko mod cost?: The default build is a few hundred dollars before shipping and taxes. The page labels the discontinued SPB143 comparison as historical, while the mod total updates with catalog pricing. It is a mod build using aftermarket parts inspired by the design.
What is a 62MAS and why is it a popular mod target?: The 62MAS is Seiko's first purpose-built dive watch from 1965. Its plain sunburst dial, black rotating timing bezel, and crown-guard-free case make it a common vintage-diver look in the mod community.
Does this build use a date?: Yes. The curated grey dial has a standard 3 o'clock date window, paired with the NH35 movement's date display.
How hard is a 62MAS-inspired build?: Beginner. It uses the same widely available SKX007/SRPD-compatible parts system as most first builds, with a smaller case and no crown guard to work around.

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