The short answer: NH35 is the dependable workhorse with a date, NH38 adds an open heart, NH72 shows the whole movement, VK63 is a chronograph with a proper snapping hand, and the Miyota 8285 adds the day next to the date. All but the VK63 are automatic.
When you build a watch to order, the movement is the one decision you cannot change later without taking the watch apart. A dial or a strap is a five-minute swap — the movement is not. So it is worth understanding what each of the five means in practice.
Seiko NH35 — the default
The NH35 is an automatic movement with 24 jewels and a date. It winds from the motion of your wrist, and you can also wind it by hand with the crown, which plenty of automatics at this price cannot do. It also hacks — pull the crown all the way out and the seconds hand stops, so you can set the watch to the second.
If you don't know what you want, this is what you want. It is the most widespread automatic in its class precisely because it can be serviced anywhere and its parts are not exotic.
Seiko NH38 — the open heart
The NH38 is the same movement as the NH35, minus the date wheel. In its place the dial carries an aperture that shows the oscillating balance underneath — this is what people mean by open heart. If the date on the dial is clutter to you and you would rather the watch showed you how it works, the NH38 is the one.
Seiko NH72 — the skeleton
The NH72 goes further: the dial is opened up so the whole movement is visible, from the front and through the caseback. Technically it is the NH35 without a date. This is a watch you buy because you want to look at the mechanics, not because you need to know the time.
One practical note: skeleton dials are harder to read in poor light, because the hands blend into the movement behind them. That is a trade-off you make deliberately.
Seiko VK63 — the chronograph
The VK63 is meca-quartz: the time runs on a battery, but the stopwatch is mechanical. Press the pusher and the chronograph hand starts instantly, and on reset it snaps back to zero in one movement — exactly like a mechanical chronograph, without the price of one. It also keeps time more accurately than any automatic on this list.
The trade-off: the battery needs replacing from time to time, and the movement does not wind itself.
Miyota 8285 — day and date
The Miyota 8285 is a Japanese automatic that shows the day of the week as well as the date. If you wear a watch to an office every day, that is the one complication with genuine daily use. We fit it across the Daylux family.
Side by side
| Movement | Type | Shows | What you see |
|---|---|---|---|
| Seiko NH35 | automatic | hours, minutes, seconds, date | closed dial |
| Seiko NH38 | automatic | hours, minutes, seconds | open heart |
| Seiko NH72 | automatic | hours, minutes, seconds | full movement (skeleton) |
| Seiko VK63 | meca-quartz | time + stopwatch | three registers |
| Miyota 8285 | automatic | hours, minutes, seconds, day, date | closed dial |
Every watch we make has a 316L stainless steel case and sapphire glass, whichever movement is inside. Each one carries a two-year warranty.
So — which one?
If you wear a watch daily and want it to simply work: NH35. If the mechanics interest you: NH38 or NH72. If you time things, or you like the look of three registers: VK63. If you want day and date: Miyota 8285.
The wrist size guide covers the other half of the decision — how big the watch should be.
Frequently asked questions
What is the power reserve on these movements?
Roughly 41 hours on the automatic Seikos (NH35, NH38, NH72) and around 42 hours on the Miyota 8285. In other words, the watch keeps running for about a day and a half after you take it off.
Do I have to wind an automatic watch?
Not if you wear it daily — the motion of your wrist winds it. If you leave it off for a few days it stops, and you wind it by hand with the crown and reset the time before wearing it again.
Is a quartz movement worse than an automatic?
It isn't worse, it's different. Quartz is more accurate and needs no winding; an automatic has no battery and is more interesting to watch. The VK63 in our chronographs combines both.
Can the movement be changed later?
Technically yes, but it means a watchmaker taking the watch apart, which rarely makes sense at these prices. So choose the movement now — the strap you can change any time.
