The photo was taken at the Barber Vintage Museum and was photographed by Chuck Schutz as found posted on his Flickr stream.
I first became aware of the Valmobile Folding Scooter when I saw it listed in a Travco Brochure of Optional Equipment.
Sadly Myrtle was not so lucky to come with a matching Valmobile! These scooters were often called suitcase scooters and were made in Japan in the 1950's and 1960's. You can read more about this little gem (and watch a video!) in this article: Valmobile Scooter Can Unfold and Go. This flickr photo link shows the: Valmobile with Sidecar!
This website has some Valmobile parts for sale, as well as a Parts Manual in CD format: Valmobile.