Hey everyone, thanks for checking out this post I need some direction. I got a tractor trailer horn with a 1939 patent date on it. They said they pulled it off a tractor trailer, and I was looking for guidance as where to go online, who knows about antique truck horns ? This thing is awesome I am just trying to figure out. Here is my link to the horn, I have no idea what it is worth.

Antique 1st Tractor Trailer Horn 1939 Dual Trumpet Patent WW2 Truck Dodge Ford | eBay

Any help is appreciated!