The first postage stamps issued in St. Louis with a first day of issue ceremony were the Louisiane Purchase Exposition Issue (Scott #323-327) on 30 April 1904. Gee, I wonder what event it supported???
Louisiana Purcahse Exposition Issues (Scott #323-327)
![](https://i0.wp.com/greatermoundcity.org/wp-content/uploads/2024/04/32832e82d0edea53c1a84104e1bcb896.jpg?resize=1024%2C540&ssl=1)