Help! Day Date changing over at 4 on 7750

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I don't know what happened. I have an IWC 3706 fleiger chronograph with a 7750 based movement. The day date was switching over at midnight but for some reason today when I was setting it I noticed that the day date switches over at 4pm. It slowly starts moving at 3 and switches over at 4. I'm not sure what happened, did I mess it up somehow?
 
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I don't know what happened. I have an IWC 3706 fleiger chronograph with a 7750 based movement. The day date was switching over at midnight but for some reason today when I was setting it I noticed that the day date switches over at 4pm. It slowly starts moving at 3 and switches over at 4. I'm not sure what happened, did I mess it up somehow?
Did you try to adjust the date and time between 10pm and 2am? Some movements are sensitive to that, though I don't know whether this one is. The user manual, should you have it, will say so if it's true. Hopefully, your watch is still covered by warranty?

In any event I hope it is not an expensive fix.
 
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If you used the quick set date function when the date change was already in progress, this can cause damage to the date mechanism.