Vintage HONEYWELL The Round Heating Cooling Mercury THERMOSTAT Manual

Description

Vintage HONEYWELL The Round Heating Cooling Mercury THERMOSTAT Manual
Not tested as a thermostat
HOWEVER
I did test it in didn't temperature areas (outside, fridge for a few minutes) and the temperature gauge did move (see pics)
Please view all photos as that is part of the description of the condition
WE ARE A SMOKE FREE HOME