Sinn EZM 1

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Main Article: Sinn EZM

EZM 1 (Ref. 503) was a Mission Timer produced by Sinn from 1997 through 2004.


Sinn introduced the Einsatzzeitmesser (EZM) line of special-purpose watches in 1997 with this EZM 1 and the Sinn EZM 2. It is an unusual chronograph with left-side crown and pushers and no subdials. The chronograph minute and seconds counter are centrally-located hands, along with running hours and minutes. The date is in a small window at 3:30.

The case, Reference 503, measured 40 mm in diameter and was 16.5 mm thick. It housed the Lemania 5100 chronograph movement.


Lemania 5100 chronograph


Ø 40 mm, height 16.5 mm
Sapphire crystal
Screw-in crown
Waterproof to 130 bar


Black, indexes with white luminous material
Hours and minutes hand with white luminous material
Central chronograph minutes and seconds hands


Hours, minutes
Chronograph minutes, seconds
Date window


Leather strap


Production: 1997-2004