There's about a dozen various "Owen Automatic" lenses in various mounts out on FleaBay (so bid now!
). The most common feature seems to be the green text on the front - some of them have an odd (to me) focus mark with an orange rectangle around the center mark. One teleconverter shows a box with 'Owen' as the brand, although they managed to slip an 'auto' into the description.
Edit: I might be jumping to conclusions, but there seem to be a lot of search hits for Owen AND Hanimex lenses, and the font/style of the front markings on several "Hanimex Automatic" lenses resembles the "Owen Automatic" lenses, only in white instead of green.