Horological Meandering

pisoi
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What is a chronometer certificate worth?

Hello to all PuristS,

I have been reading this site for at least two years without registering.

This is my first post because I really need your opinion on something I find rather strange.
So, here it goes: I have a small collection of watches and that I wear them all on a regular basis. Last Christmas I finally purchased a 6-head winder, set all my automatic watches precisely, set the correct winding direction for all of them and pressed the On button.
Now, after almost two month spent without any adjustment, most watches are off by some margin but the strange thing is that, contrary to what I expected, the ones with official chronometer certifications fared no better than the others. Actually, the worst offender (~12 minutes FAST in 50 days) is a watch that has only "-" (minus) figures on the COSC certificate, meaning - if my understanding is correct - that it should run SLOW under any circumstances.
Just for fun (although I don't feel like laughing, since officially certified chronometers tend to cost more than "regular" watches using the same movement), the most precise watches are a Sinn 144 chronograph "Lufthansa Cargo" with a deviation of less than 30 sec. and a... Swatch Irony (which is... ironical, if you'll excuse my pun).

Now am I missing something or what?

Thank in advance for any light you can shed on the matter.

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