The Swiss franc appreciated vis-à-vis the U.S. dollar today as the greenback tested bids around the CHF 1.0520 level and was capped around the CHF 1.0685 level.  SNB Board member Danthine said the central bank will prevent any excessive appreciation of the Swiss franc and added it has the means to achieve that objective, without dispute.  Data released in Switzerland today saw the March KOF indicator rise to 1.93 from an upwardly-revised 1.70 in February.  Swiss National Bank Vice Chairman Jordan reiterated last week that the central bank will work to prevent excessive franc appreciation.  Swiss National Bank President Hildebrand last week reported the central bank will decisively act against excessive franc strength, noting the central bank can intervene to a very large extent.  U.S. dollar offers are cited around the CHF 1.1180 level. The euro moved lower vis-à-vis the Swiss franc as the single currency tested bids around the CHF 1.4240 level while the British pound moved lower vis-à-vis the Swiss franc and tested bids around the CHF 1.5925 level.