This paper analyzes the behavior of the Swiss franc (CHF) over the past 35 years. It relates the evolution of the CHF exchange rates to economic fundamentals like the relative competitiveness of the Swiss export sector, accumulated current accounts, interest rate differentials and oil prices. Some factors like the introduction of the euro, a relative increase in Swiss domestic productivity and higher oil prices seem to have modified the CHF behavior in the last decade, but more data will be needed to draw definitive conclusions. The paper relies on different data sources and assesses potential exchange rate determinants under different angles. Overall, measurement and econometric issues would make it difficult to determine a unique econometric specification or specific values for equilibrium exchange rates.