Caseback décor
One of the ways that manufacturers could make their pocket watches more attractive was to decorate the caseback. In his post above,
@Tire-comedon shows some early (1906-1910) decorated silver cases. But in the 1930s, Omega developed many different styles, in each case naming them and advertising the different options. This was particularly relevant on some gold cases (but it was not exclusive to gold), often involving watches with 37.5 and 38.5 movements.
Some of the names used by Omega were as follows:
Rémi, Raphael, Philippe, Pallas, Raoul, Roger, Cubique, Martin.
Tire-comedon shows a Clément and the version shown by
@cosma was a Maurice.