The picture to the right shows two examples of common jangdo knives. The upper one has a pair of chopsticks with it. The bottom one is a simple dagger style. These two are not for sale in this ad but will be available in other sales. The super jangdo pictured below is the one for sale here.
Below you see this very ornate example of a Jangdo with all its parts removed. It includes the knife, the chopsticks, which appear to be made of bone and what I am guessing to be a toothpick, seen between the knife and the chopsticks. Each piece has its own fitted compartment to slide into the handle.
Dramas and movies tend to emphasize that this kind of knife was the exclusive property of women, but it was actually used by men as well. Jangdo was utilized both indoors and outdoors for such uses as cutting paper, carving a top, trimming twigs or using for self-defense. As the knife grew more prevalent during the Joseon Dynasty and its decorative nature and symbolism were emphasized as well as its practicality, a woman about to get married received a jangdo from her parents so that she could fulfill her proper role in married life; a man also got the knife from his parents upon reaching adulthood so that he could be loyal to the country and fulfill his duty to his friends.
This view shows the tops of the knife hilt, the toothpick and the chopsticks. The fitting at the top of the hilt appears to be made of bone.
Detail of the center fitting holding the belt strap
The fitting at the bottom of the sheath appears to be made of bone.
The image at the right shows a slight bit of damage that appears on the hilt (circled in red) It is difficult to see but because it has this imperfection I wanted to point it out to you.