 The clock tower of St. Peter was for centuries Zürich's 'official local time', and all public city clocks had to conform to it.The church clock of St. Peter has the largest tower clock face in Europe, the outer diameter of each of the four church clocks measures , the minute hand , the hour hand , and the minute crack of the large pointer measures .The pipe organ was installed in 1974 by "Mühleisen Manufacture d´orgues" from Strasbourg.