These were most likely Town & Country horns, these were available as an accessory from the 1930’s through the late ‘50s.
https://www.flickr.com/photos/advance-design_parts_co/44842918801/in/album-72157631868452754/These were available from Delco/GM as well as a host of aftermarket suppliers.
https://www.flickr.com/photos/advance-design_parts_co/33240486418/in/album-72157631868452754/Big bracket, big horns, they take up a lot of room. If you look at the switch you will understand the Town & Country reference.
These exact same horns appear in the 1946 Salesman Data Book, they are common on the piano hood cars and trucks, the alligator hoods much less so, the photo below shows how much room is consumed (non-factory).
https://www.flickr.com/photos/advance-design_parts_co/30831498501/in/album-72157631870734114/
