There was a thread recently about Lang's reproducing this part. I found an original one in my horn parts box. What happened to the original thread?
http://www.mtfca.com/discus/messages/257047/294957.html
Darel,
The pipe thread and grey color makes your pic look more like the Aeromore exhaust whistle right angle adapter. It would be a lot bigger than the horn part.
it is the horn part. Same size as on a 1915 horn set up that I have (original) this part screws right on any one of the 1913-15 Model T horns in my collection. I just never paid any attention to this part, loose or on the 1915 set up
It is brass. I do not shine up any of the old original parts unless the whole horn in being restored.