A Vintage Lens Mount and Lens manufacturer you probably have never heard of... - Karr Galaxy Studios
Topcon 53mm F/2 UV Lens {49} at KEH Camera
Amazon.com : Fotasy Copper Auto Topcon Lens to Cannon EF EFS DSLR Adapter, Infinity Focus, Compatible with Canon EOS 6D 5D Mark IV III II 1Ds 1D Series 7D II 7D 80D
Topcon 100mm f2.8 RE Auto-Topcor - Lens – Kamerastore
Topcon Deluxe Trial Lens Set
FotodioX Pro Lens Mount Adapter for Exakta/Auto EXAKTA-EOS-PRO
Topcon RE Auto-Topcor N 35mm f2.8 w.a. lens. US NAVY. Case. Hood. Caps. Clean! | eBay
Topcon RE Super - Wikipedia
Topcon RE Zoom Auto-Topcor 87-205mm f-4.7 Vintage Camera Lens + Case | eBay
Topcon Topcor 200mm F4.0 Tkyo Kogaku UV Telephoto Lens for Uni Unirx Auto 100 Cameras - Etsy