wicozani,
Indeed, Chopard can do "plain" too but usually that means that it's expensive
Look at this platinum model to celebrate 50 years of Mama und Papa buying the company back in 1963 and issued in 2014.
Only 50 pieces; uncomplicated though, without perpetual calendar but of 'perpetual' design.
Using a pocket watch movement.
Regards,
MTF
L.U.C 1963 Chronometer Platinum Ref.161963-9001

L.U.C 1963 Chronometer Platinum Ref.161963-9001