Staiger Crystal Clock -Working

A crystal clock made by Staiger in Germany during the early 1990s. It is in the shape of a square and has smaller squares in the back. It is working and keeps time well; I installed a new 1.5V N type Energizer battery (the dollar store was out!). The internal rear cover for the clock mechanism is missing. The clock is 4" wide by 4" tall and about 2 1/4" deep.