Vintage 60s Champion Knitwear Denim #52 Ringer T-shirt

Shirt is in VG condition with no holes, stains or marks. There is very slight fading throughout. There are 4 repair marks 2 on the front next to the collar and 2 on the back. I do not know if the numbers were factory sewn or added at a later time. I only wonder because the numbers have a different look and style from the front to the back.