Nailing the perfect all-black watch isn’t as simple as “picking all the parts in no other color but black.” It takes careful planning, a discerning eye, and maybe this guide to help you out? Here’s how to build a Seiko mod that balances looks, legibility, and that wow factor that you get with stealth watches.

For those of us who love to tinker with and modify our watches, knowing ISO standards will help you appreciate your build even more. Each feature of a dive watch, from the grippy bezel to the luminous indices, serves a specific purpose dictated by these requirements. Understanding ISO certification means understanding why your dive watch is built the way it is, so you can build watches that look good and work great.