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We show that within Bertola and Svensson's second-generation target zone model, mean-reverting interventions and endogenous devaluation risk are closely interrelated. Over the period 1983-93 we analyze the degree of mean reversion in the underlying fundamental process as well as the term structure of interest rate differentials vis-a-vis Germany for six Exchange Rate Mechanism currencies. For Austria, Denmark and the Netherlands, and for Belgium after 1990 our estimates are broadly in line with the first-generation target zone model, whereas those for France and Italy are in accordance with the model that allows for endogenous devaluation risk. (JEL F31, E43) [ABSTRACT FROM AUTHOR]