Set of 8 watch books, Germany/Switzerland around 1980-2015, 1st. pocket watches from Clutton/Daniels, 2nd. Ferdinand Berthoud M.I.H., 3rd. erotic watches from Christoph Prignitz, 4th. writings of Alfred Helwig to the art of watchmaking from Prof. Dr. Herbert Dittrich, 5th. measuring the moment, 6th. the art of precision, 7th. inventors & visionaries, 8th. the beginning of a tradition, 5th. - 8th. from Herbert Dittrich, in good & useable condition