Chopard

Calibre 1.96 Vs 3.96

 

Hi Mike

The L.U.C Calibre 1.96 is the basic movement and 3.96 is the variant but by no mean a second class calibre.

Since both are COSC certified chronometer, accuracy will be within the COSC specifications. 
The L.U.C Calibre 1.96 with the Breguet over-coiled hairspring and fine adjustment regulator would have a slight edge in term of accuracy over the flat hairspring of the 3.96.

The efforts put into finishing for both the Calibres are about the same.  The Calibre 3.96 could also almost get the Geneva Seal if it meets some of the criterias.
Included also two diagrams to further illustrate the differences between the L.U.C Calibre 1.96 and the 3.96.

The beveling of the edges (anglage) is done by hand under magnifying lenses  with the help of the tools similar to those use by dentist.

Hope that helps.

Kong