VERY RARE .421 GWEN-AERO GASOLINE BUNCH MODEL AIRPLANE COMPANY  
BUILT BY JOSEPH GWEN DAN BUNCHS FATHER IN LAW
I BOUGHT FROM A COLLECTOR WHO SAID HE WAS SURE THIS ENGINE IS A BUNCH PROTOTYPE SINCE IT HAS
NO MARKINGS AND IS STILL IN THE ORIGINAL  WOODEN BOX.  IT APPEARS TO HAVE A PISTON RING AND THERE IS NO WARE IN THE COMBUSTION CHAMBER 
LISTING IS NEW BECAUSE IT LOOKS TO HAVE NEVER BEEN FIRED
COMES WITH EVERYTHING IN THE PHOTOS

FOR MORE INFORMATION GOOGLE BUNCH MODEL AIR PLANE ENGINES