led Paul-Emile Brandt to work in 1925 towards the union of Omega and Tissot, then to their merger in 1930 into the group SSIH, Geneva.

Under Brandt's leadership and Joseph Reiser's from 1955, the SSIH Group continued to grow and multiply, absorbing or creating some fifty companies, including Lanco and Lemania, manufacturer of the most famous Omega chronograph