TLDR: A Seiko mod costs about A$150 to $300 if you build it yourself and about A$250 to $450 bought ready to wear. Ours run A$289 to $409, and most are $349. The price is set by four things: the movement, the case machining, the bracelet, and whether anyone actually checked the watch before it shipped. The last one is invisible in photos and it is where cheap builds save money.
Most articles about mod prices are written by shops selling you parts. They have a reason to make the DIY column look cheap. We sell finished watches, so we have the opposite bias, and you should read both of us knowing that.
Here are the real numbers anyway.
The short answer
Three ways to get a Seiko mod, three prices.
- Build it yourself: roughly A$150 to $300. A movement, a case, a dial, hands, a crystal and a bracelet, plus the tools. namokiMODS and Nomods, both parts retailers, put a decent first build around this mark in their own 2026 cost guides. Add your mistakes. Everyone breaks a dial foot eventually.
- Buy one prebuilt: roughly A$250 to $450. The parts, plus somebody's time assembling and regulating it, plus their warranty. This is where we sit.
- Commission a custom builder: A$550 to $1,200 and up. One-off work, your specification, a named watchmaker's hours.
Ours run A$289 to A$409. Most of the catalogue is A$349.
Where the money actually goes
Four things move the price. Only one of them is visible in a photo.
1. The movement
The engine, and the part that is always a genuine Seiko unit. The NH35 automatic is the standard: 24 jewels, 21,600 vibrations per hour, a 41 hour power reserve, and a factory accuracy rating of -20 to +40 seconds per day (Caliber Corner, Seiko Caliber NH35).
Different movements cost different money, and that is most of the gap between our $289 watches and our $399 ones. An NH35 is the workhorse. An NH34 is a true GMT with an independently settable 24 hour hand, and it costs more because it does more. Our chronographs run a Seiko VK63 meca-quartz, and we say so on the page rather than let you assume it is automatic.
If a seller will not name the calibre inside a watch, that tells you something before the price does. Our NH35 vs NH36 vs Miyota comparison covers the differences.
2. The case
A case machined to take an NH-series movement, in 316L stainless steel, finished with real brushing and polishing. Not a fashion-watch shell.
Case complexity is real money. An integrated bracelet case, where the bracelet flows out of the case rather than bolting onto it, costs more to machine and more to get right. That is why the Nautilus and Royal Oak and Seikoak builds sit above the dress shapes in our range.
3. The crystal and the bracelet
Sapphire against mineral glass is the first place a cheap build saves money. Sapphire sits near 9 on the Mohs hardness scale against mineral's 5 to 6, so it shrugs off the keys and door frames that haze cheap glass within a year. Every watch we sell has it.
The bracelet is the second. A hollow end link and a stamped clasp feel exactly like what they are the moment you pick the watch up. You cannot see it in a listing photo.
4. The part nobody photographs
Aligning the dial and the chapter ring. Casing the movement without trapping dust. Regulating the timing. Checking it before it goes out.
Parts are a commodity. Anyone can buy the same dial we can. Assembly is not a commodity, and it is the entire difference between a watch you wear for years and a watch you photograph once.
This is the honest reason a prebuilt costs more than the parts bill. You are buying somebody's hours and somebody's warranty, and if the price looks too good for that to be included, it is not included.
Why Seiko mods are cheaper than the watches they resemble
Because you are not paying for the name.
A five figure luxury watch carries a five figure marketing budget, a dealer network, a certification programme and a waiting list. A mod carries a movement, a case, a bracelet and an hour of somebody's attention. The proportions and the weight in your hand are close. The invoice is not.
That is the whole trade, stated plainly. What you give up is the name on the dial and the resale market that comes with it. What you keep is a real mechanical watch you can service anywhere.
What we charge, and why
Our catalogue, priced on 29 August 2026:
- A$289: dress builds. Datejust family, NH35 automatic.
- A$329 to $349: most of the range. Integrated bracelet shapes, open hearts, divers.
- A$399 to $409: NH34 true GMTs, and the skeleton builds.
Every one of them, at every price, has the same floor: a genuine Seiko movement, a sapphire crystal, 316L marine grade steel, a 1 year warranty on the movement, crystal, case and dial, and a real person answering the email.
We do not have a cheap tier where the crystal quietly becomes mineral. That is the spec cheap builds skip, and skipping it is how you get a $180 mod. If you want the range under four hundred laid out watch by watch, that is Seiko mods under $400.
Do Seiko mods hold their value?
No, and anyone who tells you otherwise is selling you something.
A mod is not an investment. There is no auction market, no reference number, no collector chasing a specific dial. Sell one secondhand and you will get less than you paid, the same as almost every watch under a thousand dollars.
Buy one because you want to wear it. That is the only reason that survives contact with reality.
What people actually buy
From our own books, counted on 23 August 2026 across the 174 watches we have built to order since launch: 47% were Datejust family builds, 18% Nautilus family, 9% GMT.
The everyday dress shapes outsell the divers by a distance. That surprises most people, who arrive expecting the hobby to be all about dive bezels.
The honest warnings
Suspect both directions. Far cheaper than the range above usually means the saving is somewhere you cannot see: the crystal, the bracelet, the clasp, or the fact that nobody checked the watch. Far more expensive usually means you are funding marketing rather than machining.
Read the water resistance, not the dial. Ours are rated 5 ATM, which is 50 metres. Splashes, rain and everyday wear are fine. Swimming, showering and diving are not, no matter how much a watch looks like a diver. If a dial has a big depth number printed on it, treat that as decoration and go and find the real rating.
Ask what happens if it stops. A price without an aftercare answer behind it is not really a price. Ours are built to order and the warranty is a year. Whoever you buy from, get that in writing before you pay.
If you are still working out what a Seiko mod actually is, start there. If you know and you want to see them, the catalogue is the quickest tour.
FAQ
How much does a Seiko mod cost?
About A$150 to $300 to build yourself, about A$250 to $450 prebuilt, and A$550 upward for a commissioned one-off. Ours are A$289 to $409, and most are $349.
Why are Seiko mods so cheap compared to the watches they look like?
You are paying for the watch, not the name. There is no luxury marketing budget, no dealer network and no certification programme in the price. The movement, the steel and the sapphire are real. The five figure brand is not there, and neither is its markup.
Is it cheaper to build a Seiko mod myself?
On parts, usually yes. On the first attempt, often not, once you count tools and the parts you break. It is a genuinely good hobby and a slow way to get one good watch.
Do Seiko mods hold their value?
No. There is no resale market to speak of. Buy one to wear.
What is the cheapest Seiko mod worth buying?
Less about a number than a floor. A genuine named movement, a sapphire crystal, real steel, and a seller who will still answer an email in six months. Below that, the price is low because something was left out.
Why is one Seiko mod A$289 and another A$399?
Mostly the movement and the case. An NH34 true GMT does more than an NH35 and costs more. An integrated bracelet case costs more to machine than a dress case.