Try uploading the photo again, JPG format. No special characters. If on the web, try uploading from your local computer instead.
Most of the references I'm seeing are mid 80's German.
They seem to be somewhat rare, but perhaps not particularly expensive in Europe.
Damenfahrrad happich carry bike in Nordrhein-Westfalen - Kreuztal | Gebrauchte Damenfahrräder kaufen | eBay Kleinanzeigen
However, prices for a European novelty in the USA may be quite different.
How does it ride? Does the frame flex? Do you have a carrying case?