This is an original cast iron piston for an old gas engine.  It is 3 5/16" in diameter with a tape measure and 3 11/16" long overall.  It has a 1" diameter wrist pin hole that is about 1 5/8" on center from the top of the piston.  It is in good condition with no cracks, breaks, or repairs of any kind but one ring is stuck in a groove as can be seen.  Please measure your engine to be sure it works for your application.   These original parts are quite tough to find in the wild or even at swap meets!  If you've been looking for one to complete a restoration or to replace your broken or repaired one here's your chance.  The pictures tell the story.  It would surely beat making one!  I can be reached at: 262 573 193 1 if you'd like to talk about it.  Good Luck.