My Model D with a straight intake.

[traintraveler]

Excuse me if I'm posting in the wrong forum.
I bought this thing off of eBay a few years ago, around 2020 or 2019 I think. It came from an owner who lives (or lived) in Denver, CO. They also did a very poor paint job on this, but I will be restoring this one soon. It does work. Not entirely sure if it was originally installed in Denver, but the siren itself "was installed on a building built in 1960." What's strange about this one is that it has a straight intake while most other Model D's I've seen have a curved intake. This almost makes me think this is a Model L sometimes, but the tag says it's a Model D. Can anyone help me out with identifying this one? Would also like to figure out which year this one was built.

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[Chicagosiren-hunters]

Unfortunately there’s no way to really tell when this siren was made, as in the late 70s/early 80s Federal stopped putting date codes on small industrial sirens like this. That being said, it looks like you have something incredibly uncommon: a Model D at the end of production, essentially just a Model L. Congratulations!

[duckwaddledup]

It could be a custom model D. for Denver, but I don't know; I might be wrong.

[Kasey]

It could be a custom model D. for Denver, but I don't know; I might be wrong.

Why would D be for Denver? That literally makes no sense.

[TheSirenFan]

It could be a custom model D. for Denver, but I don't know; I might be wrong.

Erm... the model letters don't stand for company names my dude.

[duckwaddledup]

That's not what I was referring to; it could have been a custom model D or something.

[traintraveler]

It could be a custom model D. for Denver, but I don't know; I might be wrong.

Unless that is a typo, D does not stand for Denver. This is a siren made by Federal Sign & Signal. It would be even more unlikely be a custom model because there is next to no point of having a customized industrial siren that already had a perfectly usable intake on all of the other models. It was already confirmed in the 2nd post on this thread that this Model D that was made at the very end of their production.