I am in the process of clearing my parents' house, and I spent a dusty (but nevertheless pleasant) day going through my late father's papers.
One item that I found interesting was his first passport, issued in 1937 when he was 21. It was, of course the navy blue model with the two slits in the front cover for the document serial number and the bearer's name.
The entire booklet was hand-written in green ink. My father's "national status" is given on the first page as "British Subject by birth". I was amused to see an "observation" (dated on the same day the passport was originally issued) on page 5 noting a discrepancy in the spelling of the surname on the cover. Clearly the clerks at the Foreign Office were discouraged from wasting blank passports!
The validity for travel is somewhat quaint, too. Mr Chuchinchow Snr was accorded the privilege of travelling throughout "the British Empire [see Regulations 6 and 7], all Countries in Europe including the Union of Soviet Socialist Republics and Turkey". In actual fact, he only made it to Dieppe from whence he took a train to Paris.
The passport was due for expiry on 17 July 1942, but by that time CCC Snr had travelled far and wide, on his Sovereign's behalf, without any need for a passport. He did need a steel helmet, though.