Link to a Flickr set of old photos, mostly nudes, all in stereoscopic 3D. Some appear to be very old (1900s?), others from the '50s and '60s. (thanks, jay)
Reader comment: David says,
One of the great early American comedians, Harold Lloyd (his movie "Safety Last" is a classic), photographed a lot of Hollywood starlets nude and in 3-D, including Marilyn Monroe, Bettie Page, etc. A few years ago, his daughter compiled a book of the best shots: Amazon Link.