The Union Dairy Cafe in St. Louis MO was located at Washington and Jefferson Avenues in the early 1900's as a part of the Union Dairy. The card has a rather humorous message on the reverse. The card has been sent through the mail and has both a canceled stamp and a postmark of Jan. 17, 1911. The card is in good condition with minor bumped corners.
An internet search of the Union Dairy Co in St. Louis shows that there were several litigations with the dairy involving adulterated or tainted milk. This is interesting in light of the very pretty and pristine look of the cafe!