Hello! Thanks for the comment. I found out that Electric Autolite Ltd. (Sarnia, Ontario) was in operation from 1930 until it merged with another firm in 1963, so that gives a timeframe to when your horn was manufactured. Looking at other examples online shows that yours was probably made in the 1930s to early-1940s and were used in early Dodge trucks and even Jeeps used in WWII (depends on the horns length). It seems they are interchangable with other makes too. They are sought after by restorers and rat rodders so I'd definately hold onto it or try and sell it if I were you. Prices seem to jump from about $40 to $140, dependant on condition of course. I'm nowhere near an expert on old horns but I'm sure someone could use it for their project.