These early pinups were often marketed as "French postcards," and they were popular among soldiers and sailors💱 who were looking for a bit of fantasy and escapism during their time away from home. The pinup style really💱 took off in the 1940s, during World War II.
As an image to be literally pinned up💱 (on a wall or locker door etc.), the pin-up was born in the United States in the years 1920 1930,💱 during the golden age of the press.