Hey!
That is a combination or should I say alternation between two images.
3D image is nothing new, this where called "stereoscopic photo" Like today back than they use large format camera with two lenses side by side like human eyes that can take two images at the same time. Than they will make prints with those two images side by side to be view with a stereoscope viewer to see the photo in 3D.
Believe it or not some of the stereoscopic picture of famous places were sold as a souvenir.
Actually I almost bought a stereoscope viewer years ago at a flea market here in NYC, but the seller wouldn't take my offer

As for the stereo card or photos some can cost a lot depend on the subject matter.

Take care,
Buddy