Trinket Box Mystery

While vacationing in Northern Michigan last week, we came across a large antique "barn" in Beulah. Among the tons of bottles, cans, fishing reels, and furniture I came across this box in a locked cabinet. I liked it so impulsively I bought it.

So at this point, I'm not really concerned if it's really an antique or not, I just want to learn a little history about it. How old is it? Are there others like it? What's it really worth? The box is made of brass (I think) and about 3.5 inches wide x 1.5 inches deep x 1 inch tall. On the bottom, it's stamped with "Made in Japan" and a symbol that looks like a globe with "K I" in the middle.