Two keys appear to be permanently linked and, no matter how you look at it, there is seemingly no solution to unlocking them. However, as a highly popular puzzle since its creation during the 19th century puzzle craze, the keys are in fact separable. The hint is "Enlarge".
Object: Disassemble and Reassemble the Puzzle
Dimension: 4 1/2 in x 1 1/8 in x 1 in
Difficultly Level: 3 (out of 6)