If you'd like to swap out the band on a Kimsey watch yourself, you'll need a specific tool. We like this one from Hodinke. Otherwise, we recommend dropping by a local jeweler to swap out your band. It's a quick process, and in many cases they can do it on the spot!
Harriet’s watch straps use quick release spring bars. This means that you can change her straps out yourself in a flash, without tools. The reel below gives an idea.