Vintage clock/wall clock

Vintage quartz wall clock brand kienzle (germany) for a deco year. 60/70 or 80. It works perfectly with an lr6 battery. The front is very "clean": no stains or scratches on the lathe or on the plastic dial. On the back, presence of a residue remained glued. (installation too fast of the clock on a freshly coated wall?) which has no impact on the installed clock. Diameter 19.5 cm.