Vintage Ralph Lauren mustard yellow sweater boys sz 5 cable knit fall winter

Really pretty mustard yellow sweater the true color is the 1st and 2nd photos, more on the mustard side butter yellow? This has a navy blue polo pony logo. This is in excellent condition with the exception of a small amount of discoloration on the arm cuff at the end on the back side, it has a darker hue not sure what it is and it might wash out, looks like maybe from jeans? It's light and hardly noticeable.