[1] The club had no official existence; its name was derived from the surnames of its chairmen, Hans von Seeckt, Walter Simons, and Wilhelm Solf.
Meetings took place in the Hotel Kaiserhof with up to 400 participants, often members of the elite, discussing the issues of the time.
Although the club had little political influence, during the time of National Socialism, some of its members joined various resistance groups, including the Solf Circle.
[3] On 29 November 1921, Seeckt, Simons, and Solf entertained Walther Rathenau and Kurt von Hammerstein-Equord to dinner in honour of Chancellor Theobald von Bethmann-Hollweg, who had died on 1 January 1921, and whose birthday was on 29 November.
The SeSiSo Club continued the tradition of a gala Bethmann Dinner every 29 November.