Seiko Mod Parts

Every Seiko mod part from Nomods in one collection. Browse cases in four platforms from 37 mm to 41 mm, skeleton and solid dials in 28.5 mm and 30.8 mm, hand sets in polished and brushed finishes, seven NH automatic movements, straps and bracelets, and accessories like crowns, screwdrivers, and spacer rings. All parts are designed to work together — every case fits every movement, and every hand set fits every movement. The only compatibility variable is dial size: 28.5 mm or 30.8 mm, depending on your case. Prices start at $5 for accessories and go up to $195 for premium cases.

Dial size is the most important spec: Seikonaut / Nautilus Ultra-Thin (40 mm) and Royal Oak 41 mm cases take 30.8 mm dials. Petrichor (37 mm) and Royal Oak 37 mm V2 cases take 28.5 mm dials. A wrong-size dial will not physically fit. Read the dial size guide before ordering.

Movement compatibility: All Nomods cases accept every NH-series movement — NH35, NH36, NH38, NH34 GMT, NH70, NH71, and NH72. No adapter or spacer ring needed. Pair skeleton movements (NH70/NH71/NH72) with skeleton dials and standard movements (NH35/NH36/NH38) with solid or waffle dials.

Watch out: Skeleton dials require a skeleton movement. Pairing a skeleton dial with an NH35 shows the solid rotor plate through the cutout, which looks unfinished. Always match dial type to movement type.

How to Choose Your Parts

Building a Seiko mod watch requires four core components: a case, a movement, a dial, and a set of hands. Here is how to select each one.

Start with the case: The case determines everything else. It sets the dial size (28.5 mm or 30.8 mm), the watch diameter (37–41 mm), and the overall aesthetic. Nomods offers four case platforms: the Seikonaut / Nautilus Ultra-Thin at 40 mm with a horizontally ribbed bezel, the Petrichor at 37 mm with a domed sapphire, the Royal Oak 41 mm with an octagonal bezel and 100 m water resistance, and the Royal Oak 37 mm V2 for a compact build. Cases range from $110 to $195.

Pick your movement: For a solid-dial build, the NH36 at $55 is the best value — it includes day-date, hacking, and hand-winding. For a skeleton build, the NH72 at $95 has dark-finished bridges that look striking through a skeleton dial. The NH70 at $70 is a more affordable skeleton option with silver bridges.

Match your dial to your case: Once you know your case, you know your dial size. Browse all dials and filter by 28.5 mm or 30.8 mm. Skeleton dials ($39–$40) pair with NH70/NH71/NH72 movements. Solid index dials ($32–$40) and waffle dials ($29) pair with NH35/NH36/NH38.

Choose your hands: All seven hand sets fit every NH movement and every Nomods case. V1 Polished sets have a mirror finish for a dressy look. V2 Brushed sets have satin centers with C3 lume for nighttime legibility. The Elongated set is proportioned specifically for the Royal Oak 41 mm case. All cost $28.

Add a strap (optional): Nomods cases ship with a crown and gaskets, but no strap. The Royal Oak 37 mm cases include an integrated bracelet. For the Royal Oak 41 mm, choose a rubber strap in black, white, green, or orange ($39). The Royal Oak 37 mm bracelet is available separately for $40.

Beginner recommendation: If this is your first build, start with a Royal Oak 37 mm V2 case ($149), an NH36 movement ($55), any 28.5 mm solid dial ($29–$40), and V2 Brushed Silver hands ($28). Total cost: around $260–$270. Read the step-by-step build guide before you start.

Frequently Asked Questions

Do all Nomods parts work together?

Yes, with one important exception: dial size. Every Nomods case fits every NH movement, and every hand set fits every movement. The only variable is whether your case takes a 28.5 mm or 30.8 mm dial. The Seikonaut and Royal Oak 41 mm use 30.8 mm dials. The Petrichor and Royal Oak 37 mm V2 use 28.5 mm dials. As long as you match the dial size to your case, everything else is compatible out of the box.

What do I need for a complete build from scratch?

You need four parts: a case (with sapphire crystal pre-installed), a movement, a dial in the correct size for your case, and a set of hands. You will also need basic modding tools — a case holder, hand press, movement holder, and dust blower. Most builds can be completed in under an hour. Our build guide walks through every step with photos.

How much does a complete DIY build cost?

A basic build starts around $250–$270: Royal Oak 37 mm V2 case ($149), NH36 movement ($55), a 28.5 mm waffle dial ($29), and V2 Brushed hands ($28). A mid-range skeleton build runs about $310–$340: Seikonaut case ($149), NH72 movement ($95), 30.8 mm skeleton dial ($40), and hands ($28). Premium builds with the Petrichor case ($195) or gold-bridge NH71 movement ($95) can reach $360–$400.

Can I use these parts with cases or movements from other brands?

Nomods dials and hands use standard Seiko NH-series dimensions, so they are physically compatible with any case designed for NH35-family movements. However, dial size (28.5 mm vs 30.8 mm) and case opening dimensions vary between brands, so always verify compatibility before ordering. Nomods cases are specifically designed for Nomods dials and are guaranteed to fit.

Browse by Category

Cases — Seikonaut, Petrichor, Royal Oak 37 mm, and Royal Oak 41 mm from $110 to $195
Dials — skeleton, index, and waffle dials in 28.5 mm and 30.8 mm from $29 to $40
Hands — V1 Polished, V2 Brushed, and Elongated sets in silver, gold, and rose gold for $28
Movements — NH35, NH36, NH38, NH34 GMT, NH70, NH71, and NH72 from $55 to $95
Straps & Bracelets — Royal Oak bracelets and rubber straps from $39 to $40
Accessories — crowns, screwdrivers, extra links, screws, and spacers from $5 to $30
Tools — screwdriver kit for Royal Oak bracelet adjustments, $12
Prebuilt Watches — skip the build and get a fully assembled watch, ready to wear

Nomods is an independent modifier of Seiko watches and is not affiliated with, endorsed by, or associated with Seiko Watch Corporation or any luxury brand referenced on this page. All brand names, trademarks, and registered trademarks are the property of their respective owners and are used here solely for descriptive and comparative purposes.

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