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Just bought this watch on eBay and will give it away as a present. From Dr Ranfft's website I gather the 5AB movement was produced since 1936. Together with the circle symbol on the movement, this suggests a date of 1944.
I have been looking through the vintage ads on this website and the model that was marketed as 'Cleopatra' in the 1940'ies seems a very close match to me. I have added one example from 1942, but there are very similar ads from 1941 and 1943.