In the late 1940s, STEIN Photo produced a series of 90 real photo postcards with white borders. Printed on EKC (Eastman Kodak Company) postcard paper, each negative was numbered and titled in English, with "STEIN Photo" neatly placed in a lower corner. On a series of 20 views made for Casa Contenta, information appears in typeface on the front of the cards.
Stein also worked in color film. "Lusterchrome" postcards, given courtesy of the National Tourist Bureau, were printed by Tichnor Bros. in Boston, Massachusetts. Stein also produced a large series of color slides depicting tourist attractions. His photography studio was at 6a. Ave. 10-45 in Guatemala City.