{G-Karte}
The hand that indicates the month (jan...dec) came off. As the watch has an "open hart" I assume the hand fell into the mechanics.
The button to set the month (jan..dec) is not working properly either. When you push the button, it grinds the case of the watch, making it harder to push the button. It also does not always go back to its original position afterwards. This is very clear when comparing with the button to set the day of the month (1 to 31), which works properly.