This is something I learned when I spent a lot of time with motorcycles.

A watch like any other piece of machinery benefits through being kept clean. During the cleaning process get to know your watch: have a look at the way parts fit together, the way things lie in relation to each other, how the clasp of your bracelet works or the way a strap develops a groove from the buckle when you do it up.

By becoming familiar with your machinery you're more likely to notice when something goes awry, maybe pick up a small problem before it becomes a major one. That crown starting to feel a little notchy when you wind 'er up in the morning? Didn't feel like that yesterday did it? Mmmmmmmm....