The description on the front of the card:
Entrance to Blue Hole, Castalia, Ohio
Estimated Date: 1930-1940s
Collection: The Blue Hole
No. in Series: 26
Era: Linen Era
The Blue Hole is a freshwater pond and was a tourist site from the 1920s to 1990 and had 165,000 visitors annually.
The description on the back of the card:
THE BLUE HOLE, CASTALIA, OHIO. Six miles west of Sandusky, Ohio, on Route 101. The depth of the Blue Hole is unknown. The visible depth is apparently 50 or 60 feet. It finds its source in an underground river and mountains a temperature of 48 degrees, winter and summer. It is not affected by floods or drought. The volume of water flowing from this marvelous spring is seven million gallons daily, sufficient to supply a city of 75,000 population.
Publisher: R.G. Tremper Sales Co., Sandusky, Ohio / A genuine Curteich-Chicago “C.T. Art-Colortone” post card, a tradename under Curt Teich Co., Chicago, Illinois.
Established in 1898, the Curt Teich Co. was best known for its wide range of advertising and postcards of North America. By the 1920s, it was producing so many postcards with borders that they became recognized as a type dubbed “White Border Cards,” creating an “era.” Later, Curt Teich’s innovations in this printing technique directly led to the production of what we now call “linens” by the early 1930s.
Read more about the Curt Teich Co.
Rights Info: Public Domain