In 2021: Centric Instruments Redefined the Solar Field Watch with the MKIII
A masterclass in minimalist utility, combining classic military field aesthetics with a modern, light-powered engine.
Image: source
The Centric Instruments MKIII 39 Vintage Black on a classic brown leather strap. Image source: Centric Instruments.
The early 2020s marked a fascinating inflection point in the watch industry, one where microbrands like Centric Instruments began redefining what enthusiasts expected from a tool watch. While major Swiss houses leaned heavily into heritage reissues and integrated-bracelet sports watches, Centric’s MKIII 39 emerged as a quiet revolution: a solar-powered field watch that didn’t compromise on aesthetics or utility.
Enter Centric Instruments. Founded with a mission to create the ultimate everyday tool watch, the brand bypassed the traditional choice between mechanical soul and quartz convenience. Instead, they focused on solar power. Against this backdrop, Centric Instruments launched the MKIII 39 in the summer of 2021, offering a masterclass in minimalist utility that resonated with a new generation of watch enthusiasts.
The Release: Sunlight as a Complication
Released during the summer of 2021, the MKIII 39 was designed to be worn outdoors, living on the very sunlight that powers it. Historically, solar-powered watches suffered from a distinct aesthetic flaw: their dials had to be semi-transparent to allow light to reach the solar cells underneath. This often resulted in cheap-looking, purplish, or plasticky dials.
Centric Instruments solved this beautifully with the MKIII. By utilizing an advanced Seiko Epson solar movement, the watch required remarkably little light to stay charged, allowing the brand to use a deeply textured, matte “Vintage Black” dial. To the naked eye, the dial looks like a rich, solid instrument face, completely hiding the high-tech solar cell beneath.
The design language of the MKIII is one of extreme restraint. The 39mm stainless steel case features clean, brushed surfaces and a slim 10.5mm profile that slips easily under a cuff. The dial is a masterclass in legibility, featuring bold Arabic numerals, a clean railroad minute track, and a discreet date window at 4 o’clock that doesn’t disrupt the symmetry of the hours.
Specifications
Here’s what made the MKIII 39 a standout in its category:
| Brand | Centric Instruments |
| Model | MKIII 39 (Vintage Black) |
| Release Year | 2021 |
| Case Diameter | 39mm |
| Thickness | 10.5mm |
| Lug-to-Lug | 46.5mm |
| Case Material | 316L Stainless Steel (Brushed finish) |
| Movement | Seiko Epson Solar Quartz (VS42A) |
| Power Reserve | Up to 6 months on a full charge (recharges with any light source) |
| Crystal | Curved Sapphire with anti-reflective coating |
| Water Resistance | 100 meters (10 ATM) with a screw-down crown |
| Strap | Premium Horween leather or heavy-duty nylon |
Legacy and Market Position
Today, the Centric Instruments MKIII is remembered as a darling of the “Everyday Carry” (EDC) and microbrand communities. It proved that a solar watch could win over even the most discerning enthusiasts: those who typically prioritize mechanical movements but couldn’t ignore the MKIII’s blend of reliability, sustainability, and design integrity.
On the secondary market, the MKIII has developed a cult following among collectors looking for a rugged, low-maintenance field watch that doesn’t sacrifice design integrity. It stands as a testament to the power of thoughtful, independent watch design.
A Mid-Summer Reflection
As we reflect on this day in 2021, the MKIII 39 reminds us of the poetic connection between horology and the environment. While mechanical watches capture our imagination with springs and gears, a solar-powered field watch like the MKIII connects us directly to the cosmos, converting the light of our nearest star into the steady, reliable ticking of time.
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