This is a rare and undocumented edition of Streamline playing cards manufactured by Arrco, likely for U.S. government use. The tuck box is made of plain cardboard stock and does not feature any cellophane wrapping or tax seal. The front of the box is overprinted with the text "FOR USE OF U.S. GOV'T", distinguishing it from standard retail versions of Streamline decks. The back design matches the classic Streamline style, with the brand name and simple border pattern. The cards inside are presumed to follow the standard Streamline layout, with Arrco's recognizable typeface and finish. The absence of retail packaging and the government marking suggest this deck may have been produced under contract for military or institutional use, likely in the mid-to-late 20th century. No reference to this edition appears in official catalogs or collector databases, making it a notable variant within the Streamline line and an item of interest for collectors of government-issued or utility playing cards.