The 70 series were dual tone and sounded good. They were, I'm practically certain, the most "junior" of the Federal sirens that coasted. I believe they could be ordered with brakes or without. I know the 60 series didn't coast. We had a 60 on our ambulance that supplemented the electronic siren. We had a Brockway engine that had a high-pitch 60 and a regular pitch 60, one of each fender, but they didn't sound good together.Nelso90 wrote:The only other one I can think of is the Model-77/78, and I'm pretty sure both of those are dual tone.