Looks like my wish list.
Got it yesterday for free. It's stamped INTERNATIONAL AIR HORNS. What should I use to clean them up. The horns look like steel with minor rust pitting and the ends look like black painted zinc alloy. Sorry about the lousy photos.
Great find Richard. I stripped my Leslie's down with your normal household paint stripper (Dad's brand I think).
This could be a good opportunity to try out some Bad Dog Polish on them new to you horns.
It took about 4 applications to get 90% of 4 coats of paint off.
It is possible they could be aluminum, casted in a sand casting. I think that is how most train horns are made.
It might be a good idea to take them apart and check to see if the diaphrams are OK and if they actually HONK HONK.