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That is Type 2 Kai-3 Bombsight of the compass version.
IJN float planes like the Type 14 patrol plane as E1Y or the Type 13 carrier attacker as B1M were equipped with it.
A very very and VERY rare collection today!
Since there were no detailed informaion about the Type 2 bombsight itself, I researched it in several equipments lists issued by IJN in the 1930s.
Thinking the situation at the time, I suspect the Type 2 bombsight was a copy of British one to be formally adopted by IJN in 1927.
Those biplanes were mainly used in the Sino-Japanese war and almost abandoned before Pearl Harbor.
Sorry but Tokyo Keiki Corp is out of my knowledge. My uncle in law was a radar designer in the company but had gone many years ago.
You are welcome, desertsky.
You may be the only one person who holds the IJN Type 2 Bombsight in the world as they began to abandon the type from 1937.
It was just ten years life.