I post this topic a few months ago: that this watch (bought new) only gave me 40 something hours Power Reserve.
I sent it back to the dealer and in a week, it came back saying that there was no problem. (I guess it didn't go back to Switzerland).
I tested it again a few times, and it still gave me some 40 hours.
I then changed the way I wound it: with longer strokes. Formerly, I used short winding (1/3 to 1/2 of a full winding). Now I used longer winding (3/4 of a full winding).
After 17 tests, it now consistently gives me more than 60 hours, sometimes even 67 hours with 100-130 windings.
Of course I am happy. This watch is the most accurate among the 6 watches I bought in the last 14 months, two Rolexes, one IWC, one Jaeger LeCoultre, one Omega Seamaster Master Co-axial. Needless to say, this the most elegant and classy watch I have.
No complain now, just admire it daily.
Still I wonder why it behaved the way it used to.
Oh, now, after 100 windings, I do feel some resistence. I am not going to force it beyond this point.