Shanghai 1937 Fold Out Picture Mailer

This rare picture mailer from Shanghai in 1937 is beautiful, though I don’t have any images from the fold out (if anyone has one I’d love to see?)…dated 6 November 1937 it’s a fold-out booklet of twenty War Pictures of Shanghai/Sino-Japanese War 1937 addressed to London and franked with a 5c Sun Yat Sen stamp.