Zenith

Hi All, Hopefully some of you joined me last weak, wore your El Primero-powered Zenith's and monitored the accuracy of the movement . I wore my manual wind Prime 12 hours per day and checked the daily variation at 7pm every evening. The watch was fully wo...  

. . . the swing between Days 4 and 5. Was the chrono in working mode on day 4? . . .

Hi Art, Yes, an interesting variation. I don't have a clear explanation. I may have been hiking more on the -5 day, but I used the chronograph for short periods on all days. And in the past I haven't observed a difference in performance when the chronogra... 

Maybe it was a day with a lot of time with the crown-up...perhaps one of those days sitting in front of a keyboard with your head in your hands?

. . . ;-) . . ....