I will explain. The official height is 14,4 mm (and due to the titanium case it’s quite comfortable). But it has a curved case back and depending on whether you use the time or timing side up the height will vary, as it’s asymmetric in terms of thickness (when using it for telling time it sits flat, when used for timing - in the bullhead configuration - it is tilted up, so as better to fit as a stopwatch). Hope that makes sense 😊