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September 2025

Speaking in Steel and Sapphire: MING’s 20.01 Series 5

In this Article:

  • MING designs the S5 chronograph in Kuala Lumpur with Swiss partners and reworks an Agenhor chronograph movement using brass mainplates, steel wear parts, synthetic ruby bearings, a Nivarox hairspring, and a tuned balance.
  • The S5 uses a split-case architecture with a donut mid-case and integrated hollow lugs, where four bezel pillars hide 90-degree seams and cut the screw count about in half.
  • The 20.01 Series 5 has been nominated for the Chronograph Watch of the Year category at the 2025 Grand Prix d'Horlogerie de Genève (GPHG).
9.2.2025

In watchmaking, every material shows up in the final product. You see it in the way light moves across a dial, feel it in the weight of the case, and hear it in the click of a pusher. With our S5 chronograph, the materials arose from years of persistent trial and error, testing what works both technically and aesthetically.

The S5 is our flagship chronograph. It’s a maximalist piece meant to push every part of the design, movement, and materials as far as we could take them.

MING is a small independent brand. We design and develop everything in-house in Kuala Lumpur, then work with specialist partners in Switzerland and elsewhere to build watches in limited batches. The S5 is our flagship chronograph. It’s a maximalist piece meant to push every part of the design, movement, and materials as far as we could take them.

Ming Thein founded MING in 2017 on a foundation of refined aesthetics paired with innovative materials, mechanics, and engineering.

I’m not a trained watchmaker. My background is physics, finance, and photography. But eight years in this business has taught me one thing: you don’t survive by doing what everyone else is doing. Materials are part of that challenge. Over the years, we’ve worked with titanium, tantalum, magnesium alloy, and more. Each one changes how a watch looks, feels, and wears. The S5 is a distillation of that experience.

Inside the movement

A movement is mostly brass; it’s stable, easy to machine, and fine detail holds well. Steel takes on higher-wear jobs. Bearings are synthetic ruby, which are both hard and consistent.

Some parts need specialized alloys. The hairspring is Nivarox for temperature stability. The balance wheel is made from a similar alloy to hold its moment of inertia.

For the S5, we started with a complex chronograph from Agenhor and reworked it. We reshaped the bridges and refinished the surfaces. Earlier models had a gradient of DLC coatings across the layers. They’re small details, but they add depth.

The see-through caseback of the 20.01 Series 5 made of sapphire for its hardiness and low distortion effect.

Creating the case

Normally a watch case is built like a can: the movement sits inside a middle ring, the bezel goes on top, and the case back closes from the bottom. The S5 is different. Because I wanted integrated lugs with hollows, the case had to be split in an unconventional way. The movement sits inside a donut, the lugs attach from the sides, and the bezel and case back come in from the top and bottom. 

The seams are hidden in 90-degree orthogonal divisions, so you don’t actually see where it comes together. Four pillars integrated with the bezel hold the whole thing in place, which means the watch uses about half the number of screws you’d normally need. In fact, it stays together without screws at all. They’re only there to lock it down at the end.

The 20.01 Series 5 uses MING’s proprietary Polar White lume on the sapphire top crystal.

Weight and performance

Weight in a watch is a choice. You can make it much lighter than it looks, or much denser. That contrast between what you expect and what you feel makes an impression.

Tolerances are so tight that if one jewel in the escapement is off by 10 microns, the whole thing stops.

But it’s not just perception. A mechanical watch runs 24/7, beating three to five times a second. Tolerances are so tight that if one jewel in the escapement is off by 10 microns, the whole thing stops. Materials have to survive that workload, stay dimensionally stable, resist corrosion, and be safe against skin. Every alloy and coating is chosen because it can do that and still deliver the feel we want the moment you pick it up.

Move the slider back and forth to scrub through the S5.

Dialed-in

The S5 dial starts as a single billet of titanium. We laser and micro-machine it to create fins and facets, then apply a blue PVD coating. After that, it’s lasered again to bring out additional detail. The result is a layered surface that shifts depending on the light.

We knew we wanted contrast in the different finishes, colors, and textures to control how light hits the dial. Some of it is determined by what a material will accept. Titanium takes certain surface treatments that steel won’t. Sapphire, on the other hand, can be etched in layers. We prototype, assemble, and decide by eye.

A CAD drawing of the 20.01 Series 5 dial that was used for machining.

Engineering white lume

Standard lume colors are fixed by the dopants in strontium aluminate: blue, green, yellow, orange, and pink. True white needs mixing across the spectrum, but each dopant has its own brightness and decay rate. The blend that looks white to the eye is uneven—heavily weighted toward some colors, reduced in others—and has to stay white as it fades. We kept adjusting until it worked. That’s how we achieved the S5’s Polar White lume.

What’s next

We have more than a hundred projects in the works. Some use metals never seen in watchmaking. Others involve multi-phase color-shifting coatings, seamless transitions between metal and sapphire, interference patterns, and animated effects. All of it is about how materials behave and how to make them do something new.

The S5 speaks in steel, titanium, sapphire, and light.

For me, materials are so much more than just the medium. They’re at the heart of watchmaking as a pursuit. The S5 speaks in steel, titanium, sapphire, and light. Every part of it is chosen for what it brings to that conversation.

Citations
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