Belgian-Designed · Individually Numbered

An everyday luxury automatic. Built for your wrist.

Manx is an everyday luxury automatic watch for $795. A Japan-made Miyota 9122, day and month indicators, domed sapphire and individual numbering, backed by a 5-year limited warranty.

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Manx Noir with a black dial, two calendar subdials, date window and textured black strap
Manx Blanc automatic watch on black silk
200
Numbered pieces
per run

Everyday luxury automatic.Every detail considered.

Mercier Prototype was built by one person who could never find the watch he actually wanted, so he made it. Every Mercier is designed by him. Each case is serial-numbered. Each component chosen to do its job, and then a little more.

Devin Mercier · Founder · U.S. Veteran · Belgian Heritage
Luxury Designed Differently.
Auto

Miyota 9122

Japan-made self-winding automatic. Serviceable by any watchmaker.

42mm

316L · Black PVD

Engraved caseband. Armored, precise, unmistakable on the wrist.

Sapphire

Domed Crystal

Scratch-resistant, glare-free, honest optical clarity.

10 ATM

Water Resistant

Swim, shower, live. Built for a life actually lived.

5-Yr

Warranty

Stood behind by the maker. If it's not right, send it back.

№

Individually Numbered

Every case serial-engraved. Yours, and only yours.

Innovation You Can Wear.

Manx Noir with a black dial, two calendar subdials, date window and textured black strap
Belgian-Designed · Automatic
Manx
$795
Pre-order · Ships October 31, 2026
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Manx Blanc with a white dial, dark hands and markers, two calendar subdials and black strap
Belgian-Designed · Automatic
Manx Blanc
$795
Pre-order · Ships October 31, 2026
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5-Year Warranty
30-Day Returns
Individually Numbered
Secure Checkout

Worn every day. Loved every day.

★★★★★Feedback from early prototype testers
★★★★★
"I usually wear my apple watch and honestly I forgot what a real watch feels like. I am so happy that I got this and highly recommend you getting one too."
Lane · Utah
✦ Prototype Tester
★★★★★
"I can't say enough about this watch and company. The watch is solid and fits well on my wrist. I thought the black would be hard to read but I was dead wrong. I took a chance and bought one of the first prototypes and I am so happy that I did. Even as a prototype it has held up. I get constant compliments on it at work and out in PB. Can't wait to see what they do next."
Scott M. · San Diego
✦ Prototype Tester
★★★★★
"Highly recommend! I got to test one of the first editions. The quality and attention to detail really stand out without being too flashy and it's incredibly comfortable. I'm getting compliments constantly. It's impressive, definitely worth it, check it out!"
Dexter N. · Kansas City, MO
✦ Prototype Tester

FAQ

Yes, 10 ATM, fine for everyday wear, swimming and snorkeling, though not deep-sea diving.

Ships October 31, 2026. Each piece is individually numbered.

Yes. Payments are processed securely by Shopify checkout — Shop Pay, Apple Pay, Affirm, Klarna & more. We never see or store your card details.

Email Devin@mercierprototype.com with your order number and the serial number engraved on the caseback.

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Manx Noir and Manx Blanc side by side Noir Blanc