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Amplitude problem

 

Hi
This is about one of my favorite watch Mido Commander Chronometre with ETA2837.
I have experience the low amplitude problem around 250++ along with 7-8 seconds slow per day(dial up).
I would like to have overhaul to bring back its Chrometre grade but I have no idea that with part have to change.

Please give me some idea and guide as I love this so much.

Thank you

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