The Bremont MBIII was designed to be quite simply the definitive British aviation chronometer. Tested and designed in conjunction with the iconic British aviation company 'Martin-Baker', three models available: the MBI, MBII and MBIII. The MBI is only available to those individuals who have ejected using an MB ejection seat and can be quickly identified by its red aluminium barrel. The movement is protected by an anti-magnetic Faraday cage and a specifically designed anti-shock case mount. The MB range had to withstand the same rigorous testing as the seats themselves. This included shock, vibration, temperature extremes, and salt-fog tests amongst others.