This is an original group of Briggs and Stratton air cooled engine owner's manuals.  It includes manuals/parts catalogs for the 6-S, 6B-S, 6B-SF, several 8B models, and some newer models as can be seen in the photos.  It also includes an original envelope and some warranty registration cards.  All of it is fresh from an old implement dealership and is in good condition with minor wear and soiling.  It would be great information if you have any of these engines.  The pictures tell the story.   I can be reached at 262 573 193 1 if you'd like to talk about it.  Good Luck.