This cover belonged to my great, great grandfather Waldemar E. Lee. He was a stamp collector and obviously used this cover to hold stamps. I have no idea what happened to his collection, but I am sure it was phenomenal because he was very wealthy and would have had the money to spend on such a hobby.
Has anyone ever come across covers like this before? If so, I would love to see them!

Here's a my favorite photo of him:
