Vintage Dana Scott Knitted Vest

Super cute vintage knitted vest. The buttons are knitted as well and all accounted for. No snags and no major stains, however, I am not sure if it is my eyes playing tricks on me or if it's the lighting, but in the pictures it appears that there's some possible discoloration. I couldn't see it in person, just noticed when looking at the photo. Also, I don't know the size but I want to assume loose small, snug medium.