Someone asked on the comment box about the crown worn by HM Sultan Omar Ali and HM Sultan Haji Hassanal Bolkiah. I remembered our own Sultan Haji Hassanal Bolkiah wearing an elaborate crown during his coronation in 1968. I remembered having that photograph somewhere in my hard disk. I had to search a bit to find HM Sultan Omar Ali's photograph during his coronation in 1951 (31st May). Here are both of them and here are the two different crowns.