This is a Robertshaw Vintage Model TSA Temperature Sensor for O'keefe & Merritt  Vintage # 511 

Good condition, Never installed before.  Manufactured in 1939. 

Specifications:

Base: 1-1/8" tall x 1-1/2" round 

Mtg hole centers:  1-9/16" 

Capillary:  .188 x 6" stiff Nickel

Bulb:  .3180 x .2650 (at the tip) x 2" Nickel 

There is a small chip out of the red button but it still functions fine.

This control was in a display case at the factory for many years.  Never installed.

It was originally made specifically for O'keefe & Merritt stove / oven in 1939.

Also could have been used for domestic applications by....

Admiral, Amana, American Stove, Bosch, Boston Beauty, Brown, Caloric, Chambers , Crosley, Dacor, Detroit Jewel, Detroit Stove Works, Dixie,  Electrolux, Excelsior, Frigidaire, Estate, GE, Gaffers & Sattler, Gibson, Glenwood, Hardwick, Hotpoint, Jenn-Air, Kelvinator, Kenmore, Kitchen-Aid, LG, Magic Chef, Majestic, Maytag, Modern Maid, Moffet, Monarch, Norge,  Philco, RCA, Roper, Superior, Spark, Speed Queen, Tappan, Universal, Western Holly, Whirlpool, White Westinghouse , Wedgewood ....and others.

 Good overall condition for the age. 

Where did I get this piece of History?...

The manufacturing facility of Robertshaw in New Stanton Pennsylvania had been producing gas and electric controls for Robertshaw for decades and they had created a historical collection of all the many different types of devices that were engineered and manufactured at that division as well many that came out of the Robertshaw Grayson Division in either Long Beach or Lynwood, CA.

In 1998 when the New Stanton facility closed its doors the entire museum of parts was crated up and sent to Robertshaw in Corona California where I worked for 32 years. Eventually this location of Robertshaw was also shut down. Almost 100 people were let go and everything in the building that was eligible for distribution was transferred down to Brownsville Texas. Everything else under that roof was disposed of.  A few of us saved some of the historical vintage items from going in a landfill.

I have posted many of these items on eBay and will continue to do so going forward.