Cast-iron Dornier DO X - Hubley Manufacturing Company, 1930s.
This outrageous-looking toy airplane was based on an actual outrageous-looking airplane, the 1929 Dornier DO X; see here and here. It looks like one of those contraptions in old silent films that collapse in on themselves as soon as they start moving, but it did actually get off the ground (or water, since it’s a seaplane). A huge airplane for its time (it weighed 56 tons), carrying up to 150 passengers, it proved unwieldy in flight (passengers were asked to cluster on one side or the other to help with turns) and its demonstration flight to New York via Africa was fraught with unfortunate incidents, resulting in weeks of delays. It drew huge crowds of gawkers when it eventually arrived there but, though two more examples were produced and sold commercially, the DO X was never used for scheduled flights. The prototype ended up in a Berlin museum where it was destroyed during a WWII air raid.