Help Identify This Horn

[Atlantic28]

I have a '29 ccpu with an odd-looking horn. Is this a standard Model A horn or something out of a previous owner's parts bin? It works and sounds like a bull bellowing rather than a sharp high tone. Any ideas as to the origin? No markings on the case at all.

 

[peters180a/170b]

NO Model "A' Horn...i have seen these before... i would take a guess its later in the 30's..like one under the hood ??

 

[Bob C]

Looks like this one on Epay. I've seen similar ones for old motorcycles.
http://www.ebay.com/itm/indian-harl...Parts_Accessories&hash=item4615dcd1c8&vxp=mtr

Bob