Vintage, Evergard Heat Triggered, Freon Powered Fire Alarm

Description

Vintage Freon Powered, Heat Triggered Fire Alarm.
This appears to be a complete unit, I do not know if it is charged or if it has been ever been triggered.
The tag shows that it is an “Evergard Fire Alarm”. It also reads “Simplicity In Fire Detection” as well as “Model #A-10-V”, “Serial #21522”, and “Temp Rating 136 F”.
I believe this to be from the 1950’s or possibly the 1960’s.
It measures about 9” tall, 4 5/8” wide, and about 4 1/2” deep including the mounting bracket, 5” including the glass sensor.
This is a nice piece of vintage Fire Detecting Equipment, great for any collection.