for those who have chronographs...

... if the chronograph uses a vertical clutch mechanism (ie: the chronograph drivign whell is constantly running even when the chrono hand isn't; a clutch mechanism "lowers" or "raises" a contact to that chronograph wheel which makes the hand move or not), then you can use the chronograph hand as a continuously running seconds hand without any losses of time keeping qualities. Actually, some say you should use it like that for better running of the watch and for the long term running fo the watch too.

If it is not a vertical clutch, then you should NOT use the chrono all the time as you would get loss of balance amplitude with the additional load brought on by the chronograph mechanism being brought into motion.

I have no idea which VC chronographs use which mechanism.

Piguet-based 1137...
01/09/2008 - 01:45

uses a vertical clutch mechanism in the Overseas chronograph.

also used in the Malte Tonneau chrono (VC cal 1185) (nt)
01/09/2008 - 09:49

b

malte chrono uses cal 1141 and les historique chrono uses cal 1140...
01/09/2008 - 02:11

both are based on lemania 2310, it is a traditional hand-winding column wheel intregrated chronograph slow-beating 18000vph movement.

horizontal clutch movement (nt)
01/09/2008 - 09:50

e