This is a USPS Gateway Silk Cachet Envelope.

The theme is 1982 World Series between the Brewers & Cardinals. The stamp is a 20 cent US Flag postmarked October 15 1982 Wisconsin.

Envelope size is 3 1/2 by 6 1/2 inches.

It is in excellent condition. There are no creases or folds. There is some wear from handling.