This is it! Day Seven. As of this morning at 9am you have just 6 hours left before the scroll in the cryptex is lost forever. Even so, you have no choice but to wait for the midday performance of the Schäfflertanz (Cooper's Dance) at the Rathaus-Glockenspiel, the last clock location to visit on your quest tour.The back of the Munich postcard mentions a golden rooster. I wonder if the Rathaus-Glockenspiel Wikipedia page makes any mention of a golden rooster chirping. 250Mb of data should help you look up the answer.
You have the morning free, so whatever you do, don't be late for the clock's noon performance!