Pentax 50mm f/1.4 Super-Takumar Manual Focus Lens for M42 Screw Mount {49} Early Version with 8 Elements, 6 Aperture Blades, IR Focus Mark Right of f/4 at KEH Camera
File:Super-Takumar 50mm F1.4-4649.jpg - Wikipedia
Amazon.com : Asahi SMC Takumar 50mm 1:1.4 1.4 50 mm - M42 M 42 : Electronics
Asahi Pentax Super-Takumar 50mm f/1.4 Model I (8-Element) Vintage Lens Review | ePHOTOzine
Repair: Asahi Super-Takumar 50mm f/1.4 (8-elements) | Richard Haw's Classic Nikon Repair and Review