Hi Gary, when I 1st saw "horn" I was not thinking whisle. as I have an old factory horn
that works on 110 v, fairly loud. when I got it, it is brass, but has old white paint on it,
I have the same mental problem, clean it or leave as found. after about 15 years, it is still as found.
if I had your whisle, I would leave as found and make a cage in the peak of the front of the garage
and pipe in an air line to it. when I am in the garage and see someone I know, I would activate it.
as I sometimes do with the horn.
shiny brass in nice to look at, but then when I see a whisle like you have, I like it better.
sorry, I can not give you a straight up answer. is there a name on it ?
are you going to keep it ?