MPN 11. I forgot about Allkit. It hasn't got the high front and the sweep down to the sides in the Luftwaffe style that a Bates could achieve.
On the 9th September 1966 my original SD hat had accumulated 1,000 hrs. in the back of an aircraft with me. That was when I retired it and sent it to explore the Borneo jungle some 40 miles east of Tenom.
Should you see a gibbon or an ourang-outang wearing an SD hat on your travels in Borneo; it's mine.