If you are into entomology, how can you not love this 1993 set of six unused cards?  The scan gives you the idea of what they look like, and the captions are in Korean and the scientific names:  Trichogramma dendrolimi, Gryllus campestris, Geocoris pallidipennis, Cyphononyx dorsalis, Metrioptera brachyptera, and Brachymeria obscurata.  (We did that both for you and for the search engines.)  Grade: 1