Handcrafted to order
Your watch.
Your ideas.
We take iconic Seiko and Casio movements and build them into something entirely yours — assembled with precision in the USA.
How it works
Choose your base
Pick from our curated Seiko or Casio donor watches — each chosen for movement quality and mod compatibility.
Select your parts
Dial, hands, case, bezel, crystal, and strap — mix and match from our component library or request something fully custom.
We build it
Your watch is hand-assembled, regulated, and pressure-tested before it ships. Every build gets a photo log.
It arrives
Shipped in a custom presentation box with documentation, a service card, and a 1-year workmanship warranty.
Featured Builds
SKX Diver Build
Sapphire crystal upgrade, custom dial, ceramic bezel insert.
G-Shock DW5600 Custom
Custom bezel, painted case, and aftermarket dial graphics.
GA2100 AirCasio Mod
Metal bezel, sapphire glass upgrade, and custom strap.
Alpinist Adventure
Compass bezel, textured dial, high-visibility hands.
Seiko Watches
Seiko's open ecosystem of parts makes it the gold standard for custom watch building. We work with SKX, 5 Sports, and Alpinist platforms.
SKX Diver Build
Classic dive watch platform with sapphire crystal upgrade, custom dial, and ceramic bezel insert.
5 Sports Field Watch
Rugged field watch aesthetic on the reliable 4R36 movement. Matte dial with applied indices.
Alpinist Adventure
Compass bezel, textured dial, and high-visibility hands for the outdoor enthusiast. Based on the 6R35.
Fully Custom Seiko
You choose every component from scratch. Dial artwork, case finishing, bracelet — complete creative control.
Casio Watches
Casio's G-Shock and A158 series are cult icons for a reason — tough, reliable, and endlessly customizable. We treat them with the respect they deserve.
G-Shock DW5600 Custom
The original G-Shock silhouette with custom bezel, painted case, and aftermarket dial graphics.
A158 Resin Rework
The iconic digital watch given a new identity. Custom painted case, tinted mineral glass, replacement bands.
GA2100 AirCasio Mod
The ultra-thin G-Shock gets an aftermarket metal bezel, sapphire glass upgrade, and custom strap.
GW-M5610 Solar Mod
Solar-powered toughness meets custom aesthetics. Resin rework with aftermarket bezel and strap.
Custom Casios
Full creative control on a Casio platform. You bring the vision, we bring the tools. Every custom build is a one-of-a-kind piece.
Custom GA2100 Colorway
The AirCasio silhouette in any colorway you want. Painted, coated, or wrapped — your call.
Two-Tone Resin Build
Multi-color resin case work with contrast stitching on a custom NATO or rubber strap.
Commission — Anything Goes
Have a specific vision that doesn't fit a template? Let's talk. No build is too unusual.
About Us
Flight Critical Timepieces was started by two watch nerds in Seattle who couldn't find anyone building the watches they actually wanted to wear.
We've been modding watches since 2025 — starting with our own collections, then for friends, then for anyone who wanted high quality custom casio watches.
Every watch we build gets the same attention we'd give our own. We source quality parts, we take our time, and we don't ship anything we wouldn't wear ourselves. No production line, no rush jobs.
We specialize in Seiko and Casio because we love them — their movements, their quirks, their communities. We know which parts fit, which aftermarket components are worth it, and which ones to avoid.
We limit ourselves to a small number of builds per month so every one gets our full attention.
No overcharging on parts we source for you, and all charges are broken down clearly.
Contact
flightcriticaltimepieces@gmail.com
Seattle, Washington
Instagram: @flight.critical.timepieces