I'm gonna do the rare sirens, since Federal Signal sirens are extremely common. I'll do the uncommon/rare ones.
ACA Howler (test)
Quadren Q-3200 (test)
Thunderbolt 1000 (test)
Thunderbolt 1000T (test)
4/5 Thunderbolt (Test)
Thunderbolt 1003
ACA Hurricane
Erick
STL-10 (test)
STH-10 (test)
ACA P-50 (test)
ACA P-15
ACA P-10
ACA Allertor (early model or 120)
ACA Banshee
Model 3 (early model)
Model 3 (normal model)
Eclipse 8 (uncommon where i live)
2001-DC Roundback
PN-20 & RM-130
WPS-2750
WPS-2720
That's most of the sirens I can remember off the top of my head.