This is a very hard to find NOS, new old stock, stamped steel muffler for a Wisconsin air cooled gas engine.  It is in great condition with no cracks, breaks, or repairs of any kind that I can see or know of and has never been used as can be seen in the pictures.  It is part number WIS WD98 and is about 6 inches in diameter.  It has 1 1/4" npt threads and they are in great shape.  It should be correct for several sizes and/or models of engines.  Please measure your engine to be sure it will work for you.  This muffler is ready to be used on an engine.   If you've been looking for an original muffler don't miss your chance on this one.  It will likely be a long time before another NOS one turns up!  Let the pictures be your guide.  You won't be disappointed in any way.   I can be reached by phone or text message at 262 573 193 1 if you'd like to talk about it.  Good Luck.