This is Tokyo Kogaku (TOPCON)'s earliest lens, the TOKO-Anastigmat 10.5cm f6.3. It is a lens used in the first roll and first "Etsui" of the KOKKA camera, which Tokyo Kogaku, established in 1932, began selling in 1933. I believe the image circle covers 6x9cm. The Tokyo Kogaku logo of that era is also on the nameplate. TOPCON-CLUB considers it Tokyo Kogaku's first camera lens. The lens itself is clean. There is no fungus or haze. I believe it is a non-coated lens. The shutter mechanism has been removed. The aperture is a simple mechanism that is operated manually by moving it left and right, so it is working. I think you can enjoy it on mirrorless cameras by creating and attaching it using bellows, helicoid tubes, etc. *Not Nikon F-mount in the category.