My 70s german Hercules "Klapprad" folding bike. with a few minor modifications and upgrades it turned into a very nice little bike. And the doumatic-kickshift is just a great piece of engineering
HERCULES KLAPPRAD FALTRAD 20" zoll L Klapp Fahrrad Rad 60er 70er in Rheinland-Pfalz - Dorsheim | eBay Kleinanzeigen