This was found, like a bookmark, inside a volume I was reading by Randy Alcorn. The book is entitled, "Heaven", and this was stuck in chapter 44. The chapter section is titled, "Will We Travel in Time?" I suggest you purchase this book and read it.
This sheet of stamps was inside the brochure and had the following written on the back: At Big Powder Horn you'll find a smaller powderhorn. Inside the powderhorn you'll find a very unusual watch. Put it in your pocket so you don't lose it. Find a way to bring it to me. It's a missing piece to my future. A.W.D.