Joe, my mother had a similar pot in the mid to late 1960's. It did not come with a warming trivet like yours, it did have the wire "rack/trivet" that allowed use on an electric stove element. It was a promotional sale packed full of instant coffee. I can not recall the brand. More than likely she bought it at A&P.
Here is a link with some 50's and 60's instant coffee commercials. I liked the Nescafe with "Margaret Draper"