If you’ve ever come across an old stamp collection and wondered if it might be worth something, you’re not alone. Collecting ...

The universe of investment grade stamps for the United States is one of the largest in philately. My analysis focused on more than 3,000 listed items issued before 1950 and priced at $25 or more.

The other week I was shocked to suddenly find my old stamp collection. I wasn’t even especially looking for it. I was just going through an old cabinet in the basement. There it was. Stamps from ...