Almost 40 years ago an old man gave me a 1903 S Philippine Peso. I decided to send it in to NGC for their conservation program just in case the tarnish was being caused by something corrosive. They concluded that it had mad contact with PVC and qualified for the program. I was expecting a grade of AU 58. It came back as a MS 61. Not bad for a gift. I have attached pictures of before it was sent in and after they got done.
Before


