
Unless I am very much mistaken, this is a very old Federal Model B, known as the "Lion" due to an ad that uses the slogan: "Roars like a lion". I've explored many abandoned places and always wanted to find an old siren like this, and it finally happened! (Actually I found a horn once, but there was no way up to it.)
A shot from below:

I hopped up onto the roof of the elevator machine (don't know what you call them) room to get some really close shots.

One of the rotors. As you can see, it's quite rusty and has likely been up there a very long time. However the rotor still spins fairly well.

It involved a bit of prying, but we managed to pop the motor cover to take a look at what made the siren go. Plenty of wasps have found homes under the cover. When I first lifted it I saw the nests and was like "OH SH-", but thankfully they were all unoccupied, hahaha.

Close-up of the motor. I could not find any tags anywhere unfortunately.

Ya boy.

Here's a shot of it from a higher part of the building.

So it was quite a find, that's for sure. This was the first time I ever got to see a siren up close, and it was pretty awesome. The rest of the building we explored was incredibly epic as well, with a huge labyrinth of pipes and a multi-level catwalk above all sorts of machinery.
Hope you enjoyed the pictures!