The Siren Board

I found more of these Allertors. *NOT MY PHOTOS*

I think a member here identified the old picture as a different Allertor of another system other than Denver's

Mysterious T-Bolt 111 wrote: Yes, early runs of Allertors featured a smaller intake bell and a larger output top horn like its counterpart (The Mobil-Directo)

Actually the horns are the same size for both the Mobil Directo and the Allertor. Only change was the size of the intake flare and the fact that the output "spout" on an Allertor is shifted over to one side. It's dead in the middle on a MD.