What do the numbers 60 65 70 75 on the outer ring of a watch mean?

The numbers 60, 65, 70, and 75 on the outer ring of a watch typically represent the minutes, marking intervals that help track the passage of time in a 60-minute cycle. This outer ring can also be part of a tachymetric scale, used for measuring speed based on time traveled over a fixed distance. In some watches, these numbers may indicate specific time zones or additional functions related to timing events.