Vintage GE mercury in glass thermometer!

I'm wondering if anyone has any idea when this was from or if it had any value. Definitely vintage and completely flawless and functional.
[https://lensdump.com/i/PBq0o

<a href="https://lensdump.com/i/PBq0o"><img src="https://i.lensdump.com/i/PBq0o.jpg" alt="PBq0o.jpg" border="0"></a>

 

Follow up

 

Therm2 by Rick Stanley posted Jan 21, 2018 at 10:36 PM

Thermo by Rick Stanley posted Jan 21, 2018 at 10:35 PM

 

Makes me think 1920s-40s. But I'm only guessing.

 

Welcome!

 

I guessed too early.
Late 1940s to 1951.

From Wiki:
https://en.wikipedia.org/wiki/GE_Healthcare
Go down to about the 5th paragraph under 20th century

"As the war ended, GE X-Ray Corporation continued to grow. Greater production capacity and greater expertise was needed in the core business of building X-ray tubes. Since the tubes were made from hand-blown glass, the decision was made to move the company 90 miles north to Milwaukee, Wisconsin, in order to tap into the enormous amount of glass-blowing talent in Milwaukee's beer-brewing industry. The company moved from Jackson Blvd. in Chicago to a 43-acre (170,000 m2) site in the city of West Milwaukee, which had been used for building turbochargers during the war. The street in front was renamed Electric Avenue, and the General Electric X-Ray Corporation had a new home in 1947.

In 1951, the corporate structure was dissolved and the name changed to General Electric x-Ray Department. This new name lasted less than 10 years as the department divested itself of its industrial x-ray business, widened its medical business, and took on the name of GE Medical Systems Department."

 

It is an hydrometer such as for determining the specific gravity of wet cell battery electrolyte. It only gives correct results when electrolyte is at a certain temperature, thus the built-in thermometer.

 

FOR not BY

Alcohol not mercury