A Windy Day at the Flatiron Building: Greeting from New York.

This postcard is presumably part of the Souvenir Mail CardThe “waterfall” mechanic makes five double-sided photo images of New York City landmarks flip over one by one when pulling the tab: Brooklyn Bridge, Columbia College Library, New York Clearing House, Metropolitan Museum of Art, the Bowery, Broadway south of St. Paul’s Church, Sixth Avenue at 23^rd Street, Trinity Church, Soldiers and Sailors Monument, and the New York skyline from the North [Hudson] River. Treasured souvenirs preserve memories and ensure that they will be kept.