Super rare find, new old stock in original box with hardware and instructions

Mercury has settled and might recover when stood back up over time

This is also in the American Museum of History as a very advanced design for its time

Even if it’s never used it’s a very rare find new in the box and should maybe be in a museum too

Great gift idea for someone who is in Heating and cooling business

Plus comes with a new old stock T109 thermostat as a bonus