Taisei Kōki
Taisei Kōki (大成光機) was a Japanese camera maker after World War II. Various Japanese websites say that it was the same company as the prewar Fuji Kōgaku. Indeed its logo is very similar to the Fuji Kōgaku logo, the words TAISEI KŌKI written in a cemented doublet lens design with a protuberance on top, maybe an allusion to the Mount Fuji.