Bild-Ur-Own-Devices, comes in the original mailing envelope from 1938.  It was mailed to my dad, farm kid, always fixing, building things.  See photos of some of the things you could build-Motor Scooter, Sidewalk runabout, dog racing sulky, garden barrow, bike trailer, midget miller, power mouse and more.  Very nice, looks like it just came in the mail.  In the US, combine with other auctions to save on shipping.