Talk:Siren Locations/@comment-82.26.201.146-20181125182537

Just out of intrest does anyone know of any notable differences between the 1950's sirens and the 1960s sirens. I have noticed that some have missing parts such as the heater boxes and some have varying shapes. Would any of these be telltale signs of the age. If anyone has any information on the age of specific sirens please let me know :)