I added this Crystal Sea postcard to my collection. The postcard is distributed by John Hinde Curteich, Inc. Photo by Buddy Moffet. The following description is on the back:

Largest and most beautiful of all Ohio caves. Its exquisite crystal-white stalactite and stalagmite formations are nowhere to be found in greater profusion or artistic settings. Thousands visiting Ohio Caverns acclaim it “The Most Colorful Cave in the Country.” Located on State Route 245 east of West Liberty, Ohio 43357.