From fezzes (had to get that out of my system) back to common hats, but this hat is anything but common. Robert Heath of 37-39 Knightsbridge London was a high end hatter to Royalty. The shop lasted until the mid sixties as far as information goes. Size 56, 6,5cm brim and 11 cm crown at the pinch. Very high quality finishing (have look at that liner). Stamp on the inside sweatband dates this one 1957.