This is an original Briggs and Stratton 6S air cooled engine owner's manual.  It is in the original envelope as can be seen.  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 one 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.