How does it Work?: Quartz Anniversary Clock Rotating Balls
The clock was made in West Germany and I reckon it dates to about the early or mid 1980s. A page from the Argos catalogue for Autumn/Winter 1983. Clock number 1 is an Acctim mechanical anniversary clock, while the other anniversary clocks are all quartz. Note that there is an Avia Quartz example at number 5 on the page (pic from Retromash):