The Apollo 11 moon landing happened 50 years ago. And that event was memorialized in many ways -- including on postcards. In this episode, I talk to preeminent postcard collector Mark Routh of Mark's Postcard Chat. Of course, when I get a chance to talk to Mark, we also cover a lot of postcard collecting ground. Mark offers pointers about how to get the best cards in spinners; where to find collectable cards in obscure places; and securing cachets for your postcards.