Hiroi Michiaki: This is, um, called a courier—what do you say nowadays? A postal [worker.] Umm, he takes letters and such.
Janell Landis: Ahh, yes yes yes. Mm. Mm.
Hiroi: He holds [his bag] here, and in the past, everyone walked, so the courier does this, [like] a marathon, in a way. He runs off going like this, and delivers [his letters] in various post stations in turn, and goes everywhere in Japan. A postal worker of the old days. When you turn this [part] these legs swing. Then it looks like running legs.
Janell: Yes yes yes. When you spin it.
Hiroi: And it spins around here.
For Japanese, see this page.
For video, see this page.