A watch has a soul Jean-Claude Biver, CEO of TAG Heuer Just like an engine powers a car, a watch movement, also knownas a “calibre” is the internal mechanism that makes a watch work. Think of it as the heart of the watch, pumping energy into all of the watch’s functions from its hands to its chronographs to make everything work in harmony. While a polished exterior is a must for any quality timepiece, it’s what’s on the inside that really counts.