Flags of the World says it is the Zeppelin company flag....the more colourful version(whites instead of yellow) was the Airship Corps(military) but...that would only be during the Nazi era. Hmmmm I`ll have to have a look elsewhere to see where my cap badge version comes in perhaps pre -Nazi. I have a passing interest in the airships of the period and visit the Friedrichshafen museum often. Modern versions fly from there and you can have a flight in one for about 400 euros
Champaign included ! Music, I was swooning over Joan Baez and agreeing with Bob Dylan`s protests in those days, rock was too "Yank" for me ( I worked for the USAF then and wasn't too impressed with things transatlantic ) The Zeppelin company is still operating making construction machinery in conjunction with Caterpillar(USA). The Zeppelin NT company makes the modern NT , new technology, airships. See the advertising on the model. Enjoy the boat show...you DID take a camera of course?