The Movement Behind The Watch: Automatic
Day & Night Watch Co. Movement Series
The Movement
Behind The Watch:
Automatic
Self-winding. Self-sustaining. Yours.
An automatic watch is different from everything else on your wrist. It doesn't run on a battery. It doesn't need you to wind it. It runs on you on the natural motion of your wrist as you move through the world. Here is what that means.
What It Is
It Runs
On You.
Inside every automatic watch is a rotor a small weighted piece that spins freely as your arm moves. That motion winds a mainspring. That mainspring stores energy and releases it in precise, measured increments to drive the hands.
No battery required. No charging. No replacement. As long as you wear it regularly, the watch stays wound drawing energy from your daily life to power its own.
There is something different about owning a watch that works this way. It's not passive. It's alive in a sense that no other timekeeping technology really matches.
The Sango 878 Collection
A Watch That
Earns Its Keep.
The Sango 878 Collection runs on the NH38A automatic movement a reliable, time-tested workhorse with a 41-hour power reserve and a self-winding rotor. It's been chosen for its consistency, its serviceability, and the way it feels when you look at a dial that you know is powered by something real.
Wear it. Work in it. Travel in it. The watch builds its own energy reserve from your movement. Every time you pick it up, you're continuing something that started the moment you put it on for the first time.
What You're
Actually Getting
Four things that define automatic ownership.
Self-Winding Movement
The NH38A winds itself through the natural motion of your wrist. Wear it consistently and it will stay running indefinitely. Mechanical energy, sustained by your own movement.
41-Hour Power Reserve
Set it down fully wound on a Friday night and it will still be running Monday morning. The power reserve is your buffer the time the watch keeps working even when you're not wearing it.
No Battery. Ever.
There is no battery to replace, no charging port to find, no interruption. The only maintenance an automatic needs is occasional servicing a few years apart, not a few months.
Built to Last Decades
Automatic movements are designed to be serviced and worn indefinitely. With proper care, The Sango 878 is a watch you can pass down. It doesn't expire. It evolves.
Built For Every Environment
Wear It.
Work In It.
The Sango 878 doesn't stay in the box. It goes where you go boardroom to weekend, dressed up or stripped back. The NH38A automatic movement is built for durability and daily use without compromise.
This is a watch designed to accumulate meaning over time. Every hour you wear it, it's working. Every hour you wear it, it becomes more yours.
"It doesn't just tell you the time. It tells you that your movement powers it."
The relationship between you and an automatic watch is unlike anything else. You're not just wearing it. You're sustaining it. That changes what it means to check the time.
What Every
Owner Should Know
-
01
Wear It Often
The more you wear it, the more wound it stays. Wear it at least 8–10 hours a day and the rotor will keep the mainspring fully charged. If you're a daily watch wearer, this watch will simply never stop running.
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02
After Storage
If the watch has been sitting for more than 41 hours, the power reserve will be depleted. Give it 30–40 shakes by hand to start it up, then set the time and wear it normally. It will wind back up within a few hours of wear.
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03
Accuracy Expectations
Automatic movements are accurate but not perfect expect a variance of a few seconds per day. This is normal and expected for mechanical movements. If you need precision to the second, quartz is the better choice for you. If you appreciate the character of mechanical timekeeping, this is part of the experience.
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04
Avoid Extreme Magnets
Strong magnetic fields can affect the accuracy of mechanical movements. Keep your watch away from speakers, large electronics, and magnetic closures when possible. Light, everyday exposure is not an issue.
Time Is Discipline
