Vintage Y2K Dooney & Bourke Madras Picnic Ants Shoulder Bag

Overall this vintage Dooney bag is in good condition but there is a large stain that looks like fading at the bottom of the bag which is more noticeable on the back of the bottom part of bag. I'm not sure what the stain is and have not tried to remove it. It smells clean and the inside is very clean except for one spot.