Mechanical watches are the result of great engineering. They require a sizeable investment because they represent a long history of expertise and handcrafted ingenuity, and are meant to last for a lifetime.
As well made as they are, they’re not “set it and forget it” machines. They can run trouble-free for many years, but they still require regular maintenance. Many in the watch industry suggest getting a watch serviced, anywhere between 3 to 5 years.
That said, there are some reliable signs that your watch needs to be checked by an expert – even if it has been serviced recently.