Wow. I thought the model no. meant the hp that the siren motor had. That is pretty cool. We really have found some great info about a lot of stuff.
I'll just add this to my siren dictionary stored in my mind.
"Someday soon we'll stop to ponder what on earth's this spell we're under...
We made the grade and still we wonder who the hell we are..."
-Styx, from The Grand Illusion