Coin looks ok to me, just had a clean at sometime, plus two acid test stains on OBV.
RE acid test stains reminds me when I would buy coins off a jeweler back in the early 1980's every coin would have a test stain.No internet then and online price guides, to be honest I made a killing bought every coin as scrap wow those where the days you could buy for peanuts and sell for $$$$/££££