This unused E. C. Kropp novelty card 31861 has a tiny bag of ore from Bingham stitched to the right side, as you can see in our scan.  The card itself kindly reminds you that the correct postage–if the bag was still attached–was 3 cents, or 1 cent otherwise.  Some of the ore has leached into a stain on the right edge.  Grade: 3