Hey this is pretty cool gadget. I think I saw something similar but it was much bigger approximately the size of CD. I absolutely love vintage style analog gadgets, I have analog mechanical stopwatch, several vintage compasses, and desktop barometer. I used to have old lift arm petrol Dunhill lighter, gave it to my friend who smokes. Right now the weirdest thing that I carry is a small tool for rear pistol sights adjustments, which looks like an odd shaped key, and vintage style Seiko watch model SSA283K1.