Thermos Bottle ID Help

I can't find an exact match for this Thermos. It is 6" tall, 3 1/8" wide at bottom.
Note it says "American Thermos Bottle Co" not "The American Thermos Bottle Co".
Has original cork stopper in 2" wide mouth. Model 600 search got me no matches.
Can anyone point me in the right direction?? Looking for age and any other info.
Thanks so much, Chipper Doug.

 

likely same era.........no info though...

https://www.ebay.com/itm/155654162069

 

Pre-1963 when the postal service changed CONN. for CT.

Debora

 

There's a patent date on the bottom of March 15-10. Looking for #6 thermos returned several for sale, one that said 1907. That would be based on a patent date and not necessarily the date of manufacture, but I'm guessing sometime after 1910 for yours, and maybe not too much after then. I think if you say circa 1920, you'll probably be in the ball park. But you should say you don't know with certainty.

 

No earlier than 1907 according to the evolution of the brand's logo.

https://logos.fandom.com/wiki/Thermos

Debora

 

With the wide top and non threaded cap I wonder if it was sold as a Dewar?