This is a Robertshaw Vintage Model AQ Thermostat with a black dial.  Vintage #203 Excellent condition, Never installed before.  Manufactured well over fifty years ago. 

Specifications:

Temp Range:  250-550 w/Broil  

Inlet:  3/8" Pipe 

Outlet: 3/8" Pipe

Pilot:   1/8" Tubing

Capillary:  36"

Bulb:  8-1/2" 

This thermostat will come with a envelope which includes factory printed vintage literature.  Includes a 12 page book of Operating Instructions, Cooking & Canning Charts, plus pages of "Cooking Suggestions".  Plus a one page original instruction sheet for the AQ oven control.

The AQ Thermostat was also known as the "Thermal Eye".  It was the hot ticket item in its day.  It is a throttling hydraulic thermostat with NO GAS COCK and has easy access front adjustment screws for the pilot and the bypass flame.  Maximum capacity is 32,000 BTU.

The AQ was available in different temperature ranges so it could be used on numerous commercial applications such as Ovens/Stoves, Griddles, Broilers, Fryers, Dish Washers and on the Old Classic Coffee Makers. 

Several OEM's that led the industry with equipment utilizing the "Thermal Eye" were Wolf, Connerton, Star, and Blodgett to name a few...

Also used for domestic applications....Wedgewood 900 series and other possibles are listed below....

 Excellent 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.

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, Monarch, Norge, Okeefe & Merritt, Philco, RCA, Roper, Superior, Spark, Speed Queen, Tappan, Universal, Western Holly, Whirlpool, White Westinghouse , Wedgewood ....and others.