This postcard came with the Great Northern See America First cards shown in the previous three days. However, it isn’t from Great Northern and it isn’t really a postcard. For one thing, the size is a little smaller than a standard postcard: 5-1/6″ wide instead of the usual 5-1/2″.
Click image to download a 252-KB PDF of this postcard.
More important, it is pre-addressed to a Northern Pacific passenger agent in Philadelphia. It was probably mailed to people with a cover letter inviting them to return the postcard, with their address, if they wanted more information about Northern Pacific trains or vacation destinations. I have images of Great Northern cards like this from the Minnesota History Center that I hope to post someday.