Antique Siren or Horn Car, Truck Electric 6 volt 12 volt Tested \"Very Loud\" For Sale

I purchased this item from a collector of antiques. He was unsure what this was used for? I tested this with a rheostat where I could vary the voltage. As soon as I put DC voltage to it the siren or Horn it sounded. It was similar to a duck screaming! at 12 volts it was so loud it was unbearable. The item has lots of rust, scratches and scuffs per age. I used air and blew out any loose dirt will let new owner clean & paint or leave as is. I put some heat shrink on the outer leads for protection. The siren has no markings unsure who or where it was made? The pictures are the actual rare item you will receive.Sold completely AS Is No Returns for Any Reason Parts or Repair.