I have no idea of the value of the P-660 sirens / if this is a decent deal or not. I also don't know if this one has the flapper or not.
Rare Federal 660 (pulsator) NYPD Police Fire Truck Vtg Siren 1960's...
Rare Federal 660 (pulsator) NYPD Police Fire Truck Vtg Siren 1960's Electric 12v, buddy of mine had this for along time, finally got it, hooked up to a 12v battery, its super loud!! needs a couple...
pittsburgh.craigslist.org