Here's a noisemaker you don't see often. These Screech Owl Siren Horns were made by an unknown manufacturer in the 1930s. The mouthpiece is different than all others I've seen so there is a good chance it is not original to the item. The condition of this horn is dodgy, but this certainly doesn't surface frequently.
07/24 Update: Even with the condition issues, this horn brought a strong $59.