What tools or materials would be useful for a spy? How would you design spy gear so that it wouldn’t reveal the spy’s identity? We found a post documenting some great details of real WWII spy kits. The materials included buttons, cameras, razorblades that pointed north if submerged in water, transforming boots, vinyl LP’s with hidden compartments, and more. Now you can buy recreations of the scarves from Bonhomme, or find some on ebay. Read all the details at the Core77.