GUEST: I've had this in my possession for probably 20 years now.
APPRAISER: What we have here is a a stamped envelope with a postal cancellation on it, and then this image of the Apollo 11 patch for the mission. In the postal world, this kind of envelope is called a cover. The astronauts realized that this was a pretty significant event, so they were... and they were allowed to take personal effects on board to be, quote, "flown." 214 went on the spacecraft. There were also about a thousand of them that were left here that were called the, quote, "insurance covers." And the ones that came back from the moon said, "Held for quarantine" in the area here. Of the 214 covers that went up in space, those are pretty rare. The thousand that stayed behind are still scarce. This one, I would say, at auction, is probably worth around $5,000. If it was flown, it would be maybe $30,000 to $40,000