Vintage Mechanic and Pit Crew Patch Nascar Checkered Flag For Sale

For sale we have a Vintage Mechanic and Pit Crew Patch Nascar Checkered Flag. Patches are 4 1/2” x a little over 3”. I do not know if these are official nascar patches as I haven’t been able to find much info on them. The lettering and checkered flags are embroidered. Pit crew looks clean on the front but has a stain on the back. Mechanic has some marks on the front and back. I haven’t tried cleaning them and I’m not sure what the stain is. Please check pictures and message me if you have any questions. Item is sold as is. Buyer to pay for shipping.