Can anyone ID the maker of this brass horn?

[EJohnson]

Does anybody know the maker of this brass horn?

And - the needle in the haystack question: does anybody know what make automobile(s) this was used on?

I cannot find any markings on it such as Rubes or Nonpareil. Might be under the paint but I prefer not to remove any paint at this point in time.

I believe it is for a larger car. Height is 13". Bell is 8.5" x 6.5".

It was originally painted black over the brass although someone painted more black over the original black. The bezel is nickel-plated over brass and it has a through-the-dash mounting bracket.

Thank you.