I have a few of those old proof sets like that still sealed in the envelope (I know some people say they weren't sealed from the mint but my Grandfather swears they were sealed when he got them from the mint). My Grandfather gave me 1938-2001 with a few here and there missing and I was trying to pick up a few of the sets that was missing before I hit a dry spell in my collecting a few months ago but hopefully someday I will be able to finish up the set he started so many years ago to leave to my kids or grandkids like he did me