The date dial is turn by two mechanisms. By turning the crown one set of wheels are engaged to change the date but when the watch is running or the time is being set another set of wheels is used to change the date.
Because it will not change on it's own when the watch is keeping time the wheel that is supposed to turn the date needs to be replaced.
A qualified watchmaker can do this for you.
Hope this helps.
Ken Kotoski
Yellowstone Watch Inc.
www.yellowstonewatch.com
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