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With the advent of electronic and quartz movements in the late fifties and mid sixties, purely mechanical movements increasingly became challenged to provide timekeeping accuracy equal to these approaches. In response, a relatively small group of watch manufacturers invested in increasing the speed of watch movements from 28800 BPH (4 Hz) to 36000 BPH (5 Hz) to improve accuracy, but given that quartz movements operate at over 32000 Hz (equivalent to 460+ Million BPH!), until there are quantum leaps forward in mechanical movement technology, the fastest beating mechanical movements are likely to remain 36000 VPH movements engineered in the early 1960s through the mid 1970s, and today only built by Zenith.
This site is dedicated to providing information about wristwatches made with these high frequency mechanical movements from the late 60s and early 70s. After roughly 30 years of no new high frequency movements, 2009 has become something of a renaissance year for 36,000 BPH watches with new models introduced this year by Favre Leuba and Seiko.
* beats per hour (BPH) ** vibrations per hour (VPH)
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