1960s space-age retro Ballerup Calor clock

These vintage space-age retro-style ABS plastic clocks were made in France in the 1960s. Powered by electricity and fitted with European-style two pin plugs, the clocks measure 16cm (6.25 inches) in width and 9.5cm (3.75 inches) in height. They are marked Ballerup and Calor to the front, and Made in France to the reverse, along with the encircled letters S, N and D which indicate that they were produced for the Scandinavian market. Both clocks are in excellent glossy condition, and the yellow one is in full working order. The lime green version has a tiny nick to the top back edge (see photos) and is missing the switch that would allow the alarm function to be activated.