I stumbled upon this picture of two Model 5 (or whatever variant) sirens on top of the Galion Fire Station roof. I figured they weren't photoshopped that way but I checked around for more pictures to make certain. Sure enough, I found another picture where you can see the two same sirens next to each other.
http://www.waymarking.com/waymarks/WM40H3
http://img.groundspeak.com/waymarking/d ... 36ad11.jpg
I'd love to hear the reasoning behind this.