Lacquering was common, Lindner sold a kit, I had one back in the ‘70’s. It was meant to help preserve the coin by excluding oils, moisture, salts etc, but was prone to varying thickness and dribbles.(sounds like me on a Friday night!) I don’t think it did much harm, though the ‘coin cleaner’ dip that one was meant to use first can’t have been good. It should come off easily with acetone dip, though whether your coin is lacquered I can’t tell from the photo. They usually look pretty obviously varnished.
Jerry