The Sinn EZM1 Diving Chonograph is probably the most collectible watch in their collection, a highly collectible and sought after watch. If was firstly released in 1997 for the German Military and adopted to a special Police Commando unit assigned to the Customs Police. It is powered by a modified Lemania 5100 movement, a very robust and reliable caliber. To keep it clean and functional Sinn removed all subdials and centralized the seconds and minutes counter. Interesting is also the fact that the crown and Chronograph pushers are situated on the left side with the start & stop button at 7' and the reset pusher at 11' for easier operation of the Chronograph.The EZM1 was only produced for a short span of 5-6 years until it was replaced with the later EZM1.1 reference.