You might not guess it at a glance, but this unique flipper combines two different ancient Japanese blade styles.

Judging by the motifs and style, it was possible to date the hilt ... A wakizashi is shorter than a katana—another type of Japanese sword. The samurai always carried both swords, wakizashi ...

In total, 31 Japanese swords of various styles line an exhibition room at the museum. Some of them are as valuable as government-designated important cultural properties, officials said.