This is one of the earlier World Time clocks that Kienzle started producing in 1938, probably from the 1950s.
The spring driven mechanical movement with lever escapement is self-wound by the standard AA battery.
The clock has a world map connected to a revolving time disk showing times across the world, with a simple mechanism to set the base time to any location desired.
The diameter is 25cm, height including bae is 29cms.