I found this horn in an antique shop today, and was surprised to see such a familiar company name on it. I'm wondering what it may have been used for. I would guess some industrial environment like a factory or mill, from the thick cast enclosure.
I also noticed the interesting serial number. How does Federal's numbering system work? Does A1A mean this is the first model 55 horn ever made? (unlikely)
Tomorrow I'll connect a power cord to it and see what it sounds like. I'm sure I could use it for an effective burglar alarm or doorbell.
Note, it's not really pink. It's gray with yellow areas, but I'm bad at taking pictures.