This is an antique Japanese military sake cup, decorated with an insignia of the Imperial Guards and what looks like a telescope. The words are "Nakano Signal" and the soldier's name Araki is on the back. There is very little information of the Guards signal unit when they used to call it Nakano unit (until they formally formed the 1st Signal regiment). It's probably no accident that the Nakano spy school was located in the same place.

Condition: Mint

Size: 2.75" across