Two unused United Nations aerogrammes. Both have a slight bend on the top flap.

Most items under $20 ship in a first-class envelope with collectible stamps and with glassine and card stock for protection; more expensive or heavier items may go Ground Advantage or Priority Mail. 

Check out my store for stamps, postal stationery, and covers (first day, space, flight, and more) from the US and worldwide. Most items come from my historian dad’s collection amassed over the course of more than 65 years. He specialized in the US, Nepal, and mountain climbing but collected from all continents.