MILK IS OUR LIFEBLOOD! (or in German, our lifejuice)
Swiss Milk, to be specific, in this somewhat disturbing but rustic paper cutout, 1940s.
Further images below the cut all from
100 Years of Swiss Milk Production (in German).
MILK makes you strong
Milk \pasteurized\ refreshes
Cool milk -- fabulous!
And what's milk without cookies (unrelated Bahlsen ad)
Leibniz butter cookies "for on the go"