Sears and Star-D - vintage 135mm prime lenses

Review of two versions of a Sears lens and a Star-D lens. What's the difference between these two Sears lenses? Is the Star-D lens the same as one of the Sears lenses? Flickr album mentioned in the video: https://www.flickr.com/photos/obnoid/... (I didn't include any of his photos in the video for Copyright reasons)