Quote Originally Posted by MartynJC (UK) View Post
No - it is 50Hz - which makes it quite amazing. The Chrono is a separate movement and runs at Frequency 360,000 VpH (50 Hz)

the second hand completes one revolution in 1second - allowing for read off of 100th sec. it has its own balance spring manual wind with separate PR indicator.

The main movement has a completely separate movement and barrel which is an auto wind and runs at the El Primero standard 5 Hz 36,000 VpH.


google Zenith Calibre 9004 - read all about it.
I apologise profusely Martyn.