The description on the front of the card:
Lock No. 18 on Ohio River, Between Parkersburg, W. Va. and Marietta, Ohio
Postmark Date: May 14, 1931
Era: Linen Era
Publisher: I. Robbins & Son, Pittsburgh, Pa.
I. Robbins & Sons of Pittsburgh, Penn. was a publisher of many postcards from 1911-1943 of which most were printed by Curt Teich.
Read more about I. Robbins & Son
Rights Info: Public Domain