The New Tissot PRX Chrono: Horizontal or Vertical Clutch?
Hi, I am wondering if the new Tissot PRX Chrono features a horizontal or a vertical clutch to connect the chrono gears. The A05.H31 movement is based on the ETA/Valjoux 7753 for which I found a technical manual here: http://horotec.ch/file/TECH_ETA.7753.pdf
According to the operating system as shown on page 26, it looks to me like a horizontal clutch. Can anybody confirm?
As I understood, horizontal clutches introduce additional friction and the chrono should therefore not be activated indefintely, for example in order to use the central second hands as watch seconds or the hour counter to display the hours in another time zone like GMT.
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Daniel
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Germany
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Last active: 9 months ago
It is horizontal clutch, typical of any of the Valjoux 7750 family. Very robust movements used by most swiss brands at some point.
The second point is true, horizontal clutch should not be run indefinitely if you want the watch to be accurate. It would be very unusual to see vertical clutch at the PRX price point, this really is a great movement for this price point.