Movement Break-In Period is a myth?

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Hi folks,

Do you believe in Break-In Period for modern Co-Axial Omega movements? I'm particulary interested in 8800 caliber.

I have an SMP 300 which is 2 months old. Purchased from official webstore. Sadly it is constantly losing time.

I have tried storing it dial down, crown up, crown down and it is still losing 1-2 seconds every single day.

This is the only watch I wear at the moment so it is always in use and wound.

I have checked it on timegrapher with 38 angle (as some suggested)…

Movement Break-In Period is a myth?

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