I couldn’t find the link, but the only reason for such a high bid, that I can think of, was if it was the bicycle type, G.Piel, Long Hand Horn.
This type, was exclusive to the Harley Davidson Parts and Accessories catalog.
They very rarely show up for sale, and if you have an antique Harley Davidson bicycle, and you want a hand horn on your bike, then you need one of these horns.
How much is it worth to you?
Well, I guess that depends on how sweet your Harley Davidson bicycle is.