The Sinn EZM1 uses the Lemania 5100 chronograph movement, which has a
central minute register. The sub-dials and day of week displays are not used.
The Lemania 5100 movement is out of production, and so is the Sinn EZM1.
Occasionally the question is asked whether Sinn could introduce a watch
similar to EZM1 with a central minute counter using a different movement
whether mechanical or quartz. That was discussed here and here.
Sinn EZM1 on strap
photo from drnash
EZM1 LE #207 showing titanium solid end links
photo from nairb-ca
EZM1 LE #037 on 'black and tan' NATO
photo from andy_s