I have a copy. your image is no longer on-line so I can't be 100% sure but mine is white, w/red ring, 50-200mm 3.5~4.5 APO. It sold new for $799 (MSRP) back in 1977. By 1980 is was listed for $599. These days copies go for $120 ~ $150 in "very good" condition.
It's very sharp (but not jaw droppingly so) and lives up to it's APO badge for zero or near zero CA. It's one of the better MF Zooms from that time period of that zoom range. It's also quite rare. This is one of those sleeper lenses that if people knew about would sell for several times what it currently goes for. I could see paying $250~$300 for it - It's about that good. It's just too bad it's not f/1.8~3.0 or something!