THIS IS AN OEM GENUINE NEW OLD STOCK STIHL 1107-350-0500 FUEL CAP WITH RETAINER.  EVERY SINGLE CAP HAS A CHIP ON ONE SPOT OF THE CAP WHICH MUST BE FROM THE MANUFACTURING SINCE I SEE THE SAME SPOT ON EVERY CAP.  THIS WILL BE SHOWN IN THE LAST PICTURE TO SHOW WHAT I AM REFERRING TO.  FEEL FREE TO MESSAGE ME WITH ANY QUESTIONS YOU MAY HAVE.  PLEASE BE SURE THIS PART FITS YOUR MACHINE AS I WILL NOT ACCEPT RETURNS DUE TO A BUYER PURCHASING THE WRONG PART.  IF YOU ARE UNSURE YOU CAN MESSAGE ME WITH YOUR MODEL AND SERIAL / TYPE NUMBERS AND I WILL TRY TO LOOK IT UP FOR YOU IF I HAVE ACCESS TO THE PARTS DIAGRAMS.