Enwell no.36 Bicycle Horn by Western Auto

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Vintage Enwell no.36 Bicycle Horn by Western Auto, this is a hard item to find, the box is nice for it’s age, coming loose on ends. the horn is rusty, chrome finish is flacking off as well, but horn does work well with a battery inserted, it’s pretty loud also. this is approx. 5″ long. what you see is what you get, not sure if everything you need to install this is here, looks like only one bolt?