King George VI's actual reign lasted from 1936-1952, and commemorative coins for him would typically state "Georgivs VI" rather than "Sextvs." As a result, I highly doubt the existence of any medallions labeled "georgivs sextvs rex 1652-1952." Perhaps there could be a mix-up in the dates; King George V's rule did in fact span from 1910 to 1936. Check the dates or sources to ensure accuracy.