The engineering problem at the centre of every mechanical watch is the same one that occupied clockmakers from the 13th century onwards: how to release stored energy at a controlled, predictable rate over a defined period. The mechanical watch movement solves this problem through a...
Roughly 3% of Swiss watch movements produced annually receive COSC certification. The figure is worth establishing at the outset, because the word “chronometer” appears on a significant proportion of Swiss watch dials and implies a tested standard that not every wearer knows the precise content...