Hi, that is a Chevrolet horn. it covers from 1937 to I believe 1953. Nice horns and real loud. I have three of them I have picked up at swap meets. In addition to my fords I have a 1939 Chevrolet sedan. Also to be specific that horn is considered to be the town horn of the Town and Country Horns set in Chevrolet cars. The country horns are dual trumpets that mount above the engine. Your horn mounts to a tab on the exhaust manifold on the old stovebolt straight six. Chevy of the 40's sells the small bracket that mounts to the horn and manifold. Jim Carter chevy trucks also sells the bracket.
In the picture you show with the dome cover removed there is a paper capacitor that snaps into a bracket. That keeps the sparking of the points down while it operates. This capacitor is likely bad and should be replaced.
I tested a couple of old ones for there current values and went a little oversized for insurance. I used a 10 MFD at 250 volts for the replacement. It seemed to improve the sound quality. Also clean the contacts, hook it up and adjust the screw for best tone. Easy to fix and a nice horn. I would post a picture of it mounted but don't know how to do that.
DBF 30
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