Antique German Wall Clock

This clock was purchased by my parents in Germany in the 1970s. Unfortunately that is about all I know about it. I'm hoping I can find out the manufacture, and approximate date it was made. Of course an approximate value would be nice too. There is a small sticker on the glass with "1200" on it that my father told me was placed there by an insurance appraiser but I don't know how much faith I put in that. 

Good