Re: Looking for Someone to repair my Patek Philippe Naviquartz A German web site, worldoftime.de has an identical clock for sale and describes it in part as PP Quartz, accuracy +- 0.2 sec/day... I checked our two quartz clocks with sweep second hands, one being a Seiko World Clock and the other being an inexpensive Chinese kitchen clock. The sound from the Seiko could be loosely described as a very low pitched hum. It could also be described as having a rushing or rustling sound. The Chinese clock has that too mixed with clicking and gear noise. Reading a little history of Patek Philippe revealed that they were early adoptors of new technology and the name "Naviquartz" and the timing accuracy specification are indicators that this may indeed be a quartz clock.