This is a vintage Tokyo Kogaku Japan lens, 1268424 ~ UV Topcor ~ 1:4 ~ F=200mm. Please check my other and future listings for more vintage camera lenses and cameras.  This lens is clean, has a slide out lens hood and is very smooth when turned. My online research shows it first came out in 1967 and is no longer made. It is part of the UV Topcon system. Great for wildlife photography!