It looks like the bike could be a Hawthorne Flyer?
Good detective work! The only improvement (bike-wise) in the Marilyn photograph would be the inclusion of that decorative chain guard. Perhaps a fixie conversion was done decades ago.
Alan Lloyd said:
i hate to hate on such a beautiful scene, but the pose is a little befuddling. who chopped off her arm and put her leg in such an awkward, illogical place? she seems to not understand the "pedal" concept. and who forgot to fill the tires? it's disgraceful to show marilyn with such a saggy rear!