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fkwThe W575-2's were made by the Kromo Gravure Photo Co.
Most (if not all) of the Kromo Gravure cards were issued in a boxed set (all cards machine cut), though a complete box has never been seen for the baseball set of 40 cards. But somehow the name has been connected to the set for awhile now (see 2007 SCD)
Here is examples from moviecard.com of related nonsport boxed sets.
http://www.moviecard.com/zamerican/assorted/kromo.html
Photo of boxes
http://www.moviecard.com/zamerican/assorted/kromoP.html