Old and unused linen-style card 28135 (D-14) from Dexter Press.  Considering the age of the card and the design of the building, we went online to learn more about it:  “The Jewel Box (also known as the St. Louis Floral Conservatory and the City of St. Louis Floral Display House) is a greenhouse (that) now serves as a public horticultural facility and is listed on the National Register of Historic Places.  It was designed by architect William C. E. Becker and built in 1936, (consisting) of five stepped, composition-covered wood roofs with clerestories, rather than a regular glass roof, in order to prevent damage from frequent hailstorms.”  Thanks to Wikipedia for that.  Grade: 1