said the flat stones and clay balls may well have been the forerunners of “shuriken” throwing stars and “makibishi” caltrops that later made up ninja arsenals. Iwata came to this ...
Ninjas are associated with equipment such as shuriken (throwing stars) and katana blades ... s hinged cover opens to allow reading of the time by touch. Seiko The Seiko Ninja Watch is read by touch.