The stamps in this set depict the "50th Anniversary of Mobile Post Office", "150th Anniversary of Swiss Engineers' and Architects' Association", "Bimillenary of Thermal Springs in Baden", "450th Anniversary of Lausanne University" and "Geneva Airport Rail Link".
And the stamp on the right was issued on 3rd Sept 2010 to mark the "50th Anniversary of European Free Trade Association (EFTA)".
EFTA was established on 3 May 1960 as a trade bloc-alternative for European states who were either unable to, or chose not to, join the then-European Economic Community (EEC) which has now become the European Union (EU). The Stockholm Convention, establishing EFTA, was signed on 4 January 1960 in Stockholm by seven countries.
Today, only Iceland, Norway, Switzerland, and Liechtenstein remain members of EFTA (of which Norway and Switzerland are the only remaining founding members). The Stockholm Convention was subsequently replaced by the Vaduz Convention. This Convention provides for the liberalisation of trade among the member states.