This postcard was mailed to my then 14-year-old Uncle Marius in Holland from a fellow stamp collector living in Germany, on Feb. 13, 1940. A few lines, written on the reverse side of the card, were a harbinger of things to come: “I regret that I was not able to be there. I would have loved to come over. Now I maybe have to wait. Thus, so far, I will not be able to cross the border.” Germany invaded Holland 87 days later.

— Michael van der Hout