Original vintage Cadillac horn button. I believe correct for 1954-55? Not completely sure. Really nice shape for age. Clear cover has some very minor imperfections. See pictures. Feel free to ask questions. No reserve. 

Measures around inches in diameter.

I am just starting to list a bunch of early automotive accessories from a lifelong collection that started in the 1960’s. Keep an eye on my upcoming auctions. All listings with the green background are no reserve auction and start at $0.99.