The basic improvements made to wristwatches during the first part of the last century tend to be of a complex mechanical variety. That is, anything that is resistant to dust and / or water resistant and has an automatic movement (if it is mechanical, which should be mechanical) we could describe it as a tool watch. However, today, the term applies more strictly to a set of aesthetic considerations driven by a desire for general robustness, a genuine sense of "watchmaking weight".
These watches can also come with one or more functions, or complications in the watchmaking language, but the fact that they are ever added in a useful way is another matter.
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