About Calibre Mod Co
Watches built by hand,
one at a time.
Calibre Mod Co creates premium mod watches in the GMT and Datejust styles. Each piece is assembled by hand around a reliable automatic movement, so what you wear is a considered build rather than an assembly-line watch.
The Bench
Every watch is built,
not just bought.
We start with a proven automatic movement and fit the case, dial, hands and bezel by hand. GMT and date complications are set and checked piece by piece, then the watch is sealed, adjusted and inspected before it is packed for you.
The result is a watch with the look you want and the mechanical heart to back it up.
What goes into every build
The essentials
Seiko NH35 movement
Every build runs on the proven Seiko NH35 automatic calibre: 24 jewels, hacking seconds and hand-winding.
Automatic
No battery to replace. The movement winds itself from the natural motion of your wrist.
Water resistant
Crystal, crown and caseback are sealed during assembly for everyday water resistance.
Professionally assembled
Each watch is put together, adjusted and inspected by hand before it leaves the bench.
Find your build
Explore our GMT and Datejust mods.