This is a Faraday 120 volt klaxon horn I found on Ebay. I didn't know Faraday made these. Perhaps it is a rebadged Benjamin. Whatever it is, it is incredibly loud and I felt it in my chest when testing it. My guess as to a date is sometime in the 30's or 40's.
This is why spelling, grammar, and using the right terms are important. I scored this klaxon because it was posted as an "ooga horn." Had it been correctly referred to as a klaxon, I would have probably gotten into a bidding war and ended up paying $400 instead of $60 on one bid. This is not the first time I've gotten a great Ebay deal because of a misspelled header.
http://www.youtube.com/watch?v=m_aAnKhbhCw