My 1918 Honeywell thermostat

[zenith12]

This thermostat was made during the last pandemic .it is a model 77 it works like new

 

[madman]

Wow a 7 jewel clock in a thermostat. Honeywell spared no expense, I guess they wanted an accurate clock. Kind of hard for me to tell how this one works. Don't see a mercury switch.

 

[gottahaveahoove]

amazing little piece

of machinery there.