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Hello, did you find the answer what oil do they use? thank you for your reply. Thory B.

Hi, they are very similar, depending on your needs. Same movement base, the 5980 is Chronograph Flyback only while the 5990 adds a Travel Time function that allows tracking a 2nd time on your watch (1 hour hand for Local time and another one for your Home time). Very convenient to use as a traveler. The 5990 is only 0.3mm thicker. A little difference on the chronoraph though: the 5980 has an additional 12h chronograph hour hand hence more useful if tracking >60min. events.

@@HighTime1 Hi, thank you for thr reply. I Appreciate you taking the time to offer a more in-depth description of this watch. Does the 5980 have a higher retail value than the 5990?

@@AyandaKula My pleasure, I'm glad it helps. On Patek's website, it seems the 5990 is more expensive (+8/9%) than the 5980.

It is indeed suprising but on another close-up I have, they do mesh. The "spring" system allows both pinion and wheel to remain in contact permanently. I'll post a more detailed article in the future with the pictures.

@@HighTime1 why wouldn’t they be matching pitch? Doesn’t make gear sense.

@@MagnetOnlyMotors Well, I won't go into too much details (and I'm not a watchmaker) but here is what I can tell. There are 4 1/10th pinion teeth between 2 clutch wheel teeth (the math should have fixed that, considering the time measurement requirements). The clutch wheel has to mesh also with the antibacklash wheel (1 rev/min, both with similar teeth size). The small 1/10 pinion (1 rev/12 sec) has to display 1/10, hence, to avoid aproximations when starting/stoping the chronograph, the teeth must be smaller. The pinion isn't bigger because of the lack of room, the 1/10th high speed, hence high inertia implied. Bigger teeth on the 1/10th pinion wouldn't be as precise (or would have led to accelerate strongly the hand's speed for a different 1/10th scale choice) or at the cost of energy consumption.

@@HighTime1 sorry, I understand about gears and mixing different pitches not to mention different teeth sizes simply don’t work. I don’t get why this is done here.

sir, is finland viking?

essential oils

Gum arabic but im not sure

Question of platform, materials, and cooking temps.. dial was cooked 10 times. Ceramics

Its very nice nut th watch is not nice as a whole...everyaspect should be worked out not only the nice dial

facts. what does Patek know