In a previous post, Classic Paper mentioned something that resonated with me. And that's the value of a particular piece can increase determined on what a particular stamp resides next to. I'm seeking information on the attached photos.
Mass-produced philatelic cover. Interesting but of minimal value. I would expect it to go unsold in a $1 box. Unfortunately, the address was added many years later. (Note the Zip code, which did not some out until 1963.)