Good spot, 1-11! I scoured my 'Dumpy Book of Aircraft' (1956 ed), my 'Observer's Book of Ditto' (same year) & my Shell-Mex 'Know Your Airliners' (1957 ed) but couldn't find the paint scheme in the pic. That's the great thing about retirement - you can waste hours on such trivia!
(You need to get out more. Ed.)